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# Best Power Supply for HTPC Builds in Tight Cases
- URL: https://a9droid.com/best-power-supply-htpc/
- Published: 2026-09-07T06:30:49.000Z
- Updated: 2026-09-07T09:49:14.000Z
- Description: Six small-form-factor power units compared on published dimensions, rail output, connector counts and warranty length, with a named winner and the exact cases where a different pick wins instead.
- Author: Samuel Harris
- Tags: Computers & Networking, PC Building, Computer Hardware

The best power supply for HTPC use here is the Apevia TFX-AP300W, because its 2.5 x 6.75 x 3.23 in body slides into slim media cases that reject a standard ATX unit, and its 20A on +12V covers a CPU plus a couple of drives. If your case takes Flex ATX and you're feeding a discrete GPU, the FSP FlexGURU Pro 650W is the better buy at 3.21 x 5.91 x 1.59 in. The six picks below split across three tiers. Entry buys you a bare 12V module or an external brick. The middle buys an internal unit with a real fan and standard ATX wiring. The premium tier buys efficiency certification, a five-year warranty and headroom you may never touch.

In this guide
1. [Best power supply for HTPC at a glance](#best-power-supply-for-htpc-at-a-glance)
2. [How I screened these six listings](#how-i-screened-these-six-listings)
3. [Which form factor does your HTPC case actually take?](#which-form-factor-does-your-htpc-case-actually-take)
4. [1\. Apevia TFX-AP300W 300W TFX Power Supply — Best overall](#1-apevia-tfx-ap300w-300w-tfx-power-supply-%E2%80%94-best-overall)
5. [2\. FSP FlexGURU Pro 650W — Best premium](#2-fsp-flexguru-pro-650w-%E2%80%94-best-premium)
6. [3\. Apevia ITX-AP300W 300W ITX ATX Power Supply — Best for beginners](#3-apevia-itx-ap300w-300w-itx-atx-power-supply-%E2%80%94-best-for-beginners)
7. [4\. Logisys PS480D 20/24 pin Switching 480W Power Supply — Best for families](#4-logisys-ps480d-2024-pin-switching-480w-power-supply-%E2%80%94-best-for-families)
8. [5\. GRNPOWCN 19V 3A 3.42A MINI PC Power Adapter — Best for heavy use](#5-grnpowcn-19v-3a-342a-mini-pc-power-adapter-%E2%80%94-best-for-heavy-use)
9. [6\. ASHATA 12V ATX Power Supply — Best budget pick](#6-ashata-12v-atx-power-supply-%E2%80%94-best-budget-pick)
10. [What more money buys across these six](#what-more-money-buys-across-these-six)
11. [Fan noise in a living room: what the listings claim](#fan-noise-in-a-living-room-what-the-listings-claim)
12. [Connector counts and what they lock you out of](#connector-counts-and-what-they-lock-you-out-of)
13. [What these listings do not tell you](#what-these-listings-do-not-tell-you)
14. [The verdict](#the-verdict)
15. [FAQ](#faq)

## Best power supply for HTPC at a glance

| Pick                                                                                              | Form factor & size                            | Output                   | Price                                                              |
| ------------------------------------------------------------------------------------------------- | --------------------------------------------- | ------------------------ | ------------------------------------------------------------------ |
| **Best overall**[Apevia TFX-AP300W](https://www.amazon.com/dp/B00LPTY2HM?tag=a9droid-20)          | TFX2.5 x 6.75 x 3.23 in                       | 300W+12V@20A             | [Check Price](https://www.amazon.com/dp/B00LPTY2HM?tag=a9droid-20) |
| **Best premium**[FSP FlexGURU Pro 650W](https://www.amazon.com/dp/B0GGNGLTYX?tag=a9droid-20)      | Flex ATX3.21 x 5.91 x 1.59 in                 | 650W92% efficiency claim | [Check Price](https://www.amazon.com/dp/B0GGNGLTYX?tag=a9droid-20) |
| **Best for beginners**[Apevia ITX-AP300W](https://www.amazon.com/dp/B0D96YD2SD?tag=a9droid-20)    | Mini-ITX / Flex ATX / 1U3.21 x 5.91 x 1.59 in | 300W24-pin + 4+4 CPU     | [Check Price](https://www.amazon.com/dp/B0D96YD2SD?tag=a9droid-20) |
| **Best for families**[Logisys PS480D](https://www.amazon.com/dp/B000F0DUT8?tag=a9droid-20)        | ATX tower7 x 7 x 5.9 in                       | 480W24-pin + 4-pin       | [Check Price](https://www.amazon.com/dp/B000F0DUT8?tag=a9droid-20) |
| **Best for heavy use**[GRNPOWCN 19V Adapter](https://www.amazon.com/dp/B0DGDFXVTG?tag=a9droid-20) | External brick10 ft cable                     | 19V 3.42A65W             | [Check Price](https://www.amazon.com/dp/B0DGDFXVTG?tag=a9droid-20) |
| **Best budget pick**[ASHATA 12V DC-ATX](https://www.amazon.com/dp/B07RT87S83?tag=a9droid-20)      | DC-ATX module0.63 x 1.81 x 1.38 in            | 90W20-pin, fanless       | [Check Price](https://www.amazon.com/dp/B07RT87S83?tag=a9droid-20) |

## How I screened these six listings

I started from one number: the internal clearance of the case. Wattage is the specification everyone types into a search box, and it's the one that matters least in a media box that pulls maybe 45W watching a film. A unit that won't bolt in is 0W.

So the screen ran in this order.

1. **Published dimensions.** Every pick here lists them except one, and I cut anything where the physical footprint was a mystery.
2. **A named form factor.** TFX, Flex ATX, Mini-ITX, 1U, DC-ATX, external. If the listing wouldn't say, it was out.
3. **Connector detail.** A 24-pin main and a CPU plug are the floor. Two of these six spell out SATA and Molex counts.
4. **Some stated protection or certification.** Overvoltage, overcurrent, short-circuit, or an efficiency badge.

That left a set spanning four genuinely different power architectures, which is unusual for a roundup and useful here. One caveat worth stating plainly: "HTPC" is a use case, not a specification. Only two of these listings name HTPC directly. The rest are small-form-factor units that happen to suit the job, and I've written each section around what the listing actually documents rather than what the marketing implies. You'll need to check your own chassis before ordering any of them.

## Which form factor does your HTPC case actually take?

Four incompatible standards sit in this list. Getting this wrong is the single most common way a power supply for HTPC purchase gets returned.

- **TFX** is a tall, narrow L-shape. The Apevia TFX-AP300W measures 2.5 x 6.75 x 3.23 in, which is longer front-to-back than a Flex unit and thinner across. Slim desktop chassis and many Shuttle-style boxes use it.
- **Flex ATX** is the stubby brick standard: 3.21 x 5.91 x 1.59 in on both the FSP FlexGURU Pro and the Apevia ITX-AP300W. 1U rackmount and a lot of Mini-ITX media cases take it.
- **ATX** is the full-size tower unit. The Logisys PS480D is 7 x 7 x 5.9 in. It will not fit a slim case. Period.
- **DC-ATX and external bricks** skip the internal bay entirely. The ASHATA module is 0.63 x 1.81 x 1.38 in and plugs onto the board's 20-pin header, drawing from an outboard adapter. The GRNPOWCN unit is the adapter itself.

Here's the trick: measure the bay, not the case. Pull the old unit, note the bolt pattern and the depth, then compare. Two of these picks share identical published dimensions, so if a Flex ATX unit fits, either the FSP or the Apevia ITX will drop straight in.

## 1\. Apevia TFX-AP300W 300W TFX Power Supply — Best overall

**The most completely documented rail output in this set, in the one form factor most slim media cases actually use.**

[![Apevia TFX-AP300W TFX unit with 80mm fan grille — the slim L-shaped body that fits low-profile media cases](https://m.media-amazon.com/images/I/41xAQTNqIyL._SL500_.jpg)](https://www.amazon.com/dp/B00LPTY2HM?tag=a9droid-20)

**Best for:** a slim HTPC case with a TFX bracket and a single SSD **Skip it if:** your chassis is drilled for Flex ATX only

This is the only pick here that publishes its full rail breakdown, and that's why it leads. The listing gives +3.3V@12A, +5V@12A, +12V@20A, -12V@0.3A and +5VSB@2.5A, with a stated 5% tolerance on the 5V, 3.3V and 12V outputs. That 20A figure on the +12V rail is the number that matters for a media box, since the CPU and any drives pull from it. 240W of the 300W total sits on the rail your processor uses.

Cooling comes from a single 80mm fan, the largest fan named in this entire set. Bigger fan, lower rotational speed for the same airflow. The unit weighs 2.1 lb, which for a 300W supply suggests a conventional transformer build rather than the featherweight designs you sometimes see at this output.

Input range is 115-230V AC at 50/60Hz, so it handles either mains standard. Apevia describes the full protection suite in the title.

The trade-off against the FSP is real: no published efficiency rating, no stated warranty, and 300W is half the headroom. Against the Logisys it gives up raw wattage. What it buys you is the specification sheet, which none of the cheaper picks match.

**Pros:**

- Complete rail-by-rail output figures published
- 20A on the +12V rail
- Largest named fan in this set at 80mm
- Stated 5% output tolerance
- Universal 115-230V input

**Cons:**

- No efficiency certification listed
- No warranty stated on the listing
- TFX shape won't fit Flex ATX brackets
- No SATA or Molex counts given

[Check Price on Amazon](https://www.amazon.com/dp/B00LPTY2HM?tag=a9droid-20)

## 2\. FSP FlexGURU Pro 650W — Best premium

**The only pick with an efficiency certification and a five-year warranty, and by far the most headroom.**

[![FSP FlexGURU Pro 650W Flex ATX unit — the 80 Plus Platinum badge and 40mm fan that mark it as the premium option](https://m.media-amazon.com/images/I/41eumiM3uPL._SL500_.jpg)](https://www.amazon.com/dp/B0GGNGLTYX?tag=a9droid-20)

**Best for:** a Flex ATX case running a discrete GPU or a tuner stack **Skip it if:** your media box idles under 60W

650W in a 3.21 x 5.91 x 1.59 in shell is the standout number here. That's the same footprint as the Apevia ITX-AP300W with more than double the output, which tells you where the money went. It weighs 2.18 lb, the heaviest in the set despite being physically among the smallest.

FSP claims 80 PLUS Platinum certification and up to 92% efficiency. In a box that runs eight hours a night, efficiency shows up as less waste heat inside a case with poor airflow, which matters more than the electricity bill. The company also states ATX 3.1 and Flex ATX V2.1 compliance, and lists Japanese electrolytic capacitors on the main rails.

Cooling is a 40mm two-ball-bearing fan with smart speed control, plus what FSP calls a shielding design for lower acoustics. A 40mm fan is small, so the near-silent claim rests entirely on the controller keeping it slow under a light media load.

The five-year warranty is the longest here by four years. The bracket in the box lets it serve 1U and networking duty too.

Against the Apevia TFX it costs the most in this group, and a Plex box that never exceeds 70W will never touch 650W. You're paying for the certification and the warranty.

**Pros:**

- 80 PLUS Platinum with up to 92% efficiency claimed
- 5-year warranty, longest in this set
- ATX 3.1 and Flex ATX V2.1 compliance stated
- Japanese electrolytic capacitors on main rails
- Universal mounting bracket included

**Cons:**

- Most expensive pick here
- 650W is far more than a typical media box needs
- 40mm fan is the smallest cooling in the internal units
- No rail-by-rail amperage published

[Check Price on Amazon](https://www.amazon.com/dp/B0GGNGLTYX?tag=a9droid-20)

## 3\. Apevia ITX-AP300W 300W ITX ATX Power Supply — Best for beginners

**The clearest connector list in the group, which is exactly what a first-time small-form-factor builder needs.**

[![Apevia ITX-AP300W Flex ATX unit with attached cable harness — the 4+4 CPU and 20+4 main plugs spelled out on the listing](https://m.media-amazon.com/images/I/31w8uUjsrXL._SL500_.jpg)](https://www.amazon.com/dp/B0D96YD2SD?tag=a9droid-20)

**Best for:** a first Mini-ITX build that needs a 4+4 CPU plug **Skip it if:** you need more than two SATA drives

Nothing here removes guesswork like a published connector count. Apevia lists 1x 20/24-pin main, 1x 8-pin (4+4) CPU, 2x SATA and 2x Molex. The main plug splits 20+4 and the CPU plug splits 4+4, so it works with a current board or a decade-old one. If you've ever bought a unit and discovered it had no CPU connector, you know why that list matters.

Dimensions are 3.21 x 5.91 x 1.59 in, and Apevia names Mini-ITX, Flex-ATX and 1U cases plus HTPCs and POS systems as targets. It's one of only two picks here that says HTPC out loud.

Cooling is a 40mm double ball-bearing fan with thermal speed control. Apevia states overvoltage, overcurrent and short-circuit protection. One useful note buried in the listing: the unit needs a full motherboard connection to spin up, so a bench test with just a wall socket will look like a dead unit.

There's a 1-year replacement warranty.

Against the FSP, which shares the identical footprint, this one gives up 350W, the efficiency badge and four years of warranty coverage. Against the TFX pick, it publishes connectors but not rail amperages, so you can't verify how much of the 300W reaches +12V. Two SATA ports also caps your drive count early.

**Pros:**

- Full connector list published: 24-pin, 4+4 CPU, 2x SATA, 2x Molex
- Splittable plugs for legacy and modern boards
- Fits Mini-ITX, Flex-ATX and 1U cases
- 40mm double ball-bearing fan with thermal control
- 1-year replacement warranty stated

**Cons:**

- Only two SATA connectors
- No rail amperage figures given
- Second-highest price position in this set
- No efficiency rating published

[Check Price on Amazon](https://www.amazon.com/dp/B0D96YD2SD?tag=a9droid-20)

## 4\. Logisys PS480D 20/24 pin Switching 480W Power Supply — Best for families

**480W in a standard ATX shell, aimed squarely at reviving an old prebuilt tower into a media machine.**

[![Logisys PS480D full-size ATX unit — the 7-inch square body that only fits a standard tower bay](https://m.media-amazon.com/images/I/41GngthUuoL._SL500_.jpg)](https://www.amazon.com/dp/B000F0DUT8?tag=a9droid-20)

**Best for:** reviving an older prebuilt tower used as a family media box **Skip it if:** your case is a slim desktop under 4 inches tall

Plenty of family HTPCs are just an old desktop under the TV, and that's the machine this fits. Logisys states it replaces many Dell, HP and Compaq models, which is the sort of drop-in claim that saves an afternoon of measuring. Dimensions are 7 x 7 x 5.9 in, the full-size ATX footprint.

Connectors are a 24-pin ATX with a detachable 4-pin section and a 4-pin ATX12V for the CPU. That older-style 4-pin CPU plug is telling. Modern boards often want 8-pin, so check yours. Logisys names overvoltage and overpower protection, and states FCC Part 15J Class B compliance at 115Vac plus CISPR22 at 230Vac.

At 480W it has the second-most headroom here, useful if the family box also runs a graphics card for occasional gaming or several spinning drives for a media library.

Weight is 2.06 lb, the lightest of the internal units, which is worth noting against 480W of claimed output.

The honest losses are the form factor and the documentation. It won't go anywhere near a slim case, no fan size is published, no efficiency rating is given, and no warranty appears on the listing. It's the pragmatic choice for one specific chassis, not a general recommendation.

**Pros:**

- 480W, second-highest output in this set
- Named as a replacement for many Dell, HP and Compaq units
- Detachable 20+4 main connector
- FCC Class B and CISPR22 compliance stated

**Cons:**

- Full ATX size fits no slim media case
- 4-pin CPU plug only, no 8-pin
- No fan size or efficiency rating published
- No warranty stated
- No SATA connector count given

[Check Price on Amazon](https://www.amazon.com/dp/B000F0DUT8?tag=a9droid-20)

## 5\. GRNPOWCN 19V 3A 3.42A MINI PC Power Adapter — Best for heavy use

**An external brick with a 10 ft cable and safety certification, for the growing number of media boxes that have no internal PSU bay.**

[![GRNPOWCN 19V mini PC adapter with long AC lead — the 10 ft total cable length that reaches a wall socket behind a TV unit](https://m.media-amazon.com/images/I/41fMGGdvqVL._SL500_.jpg)](https://www.amazon.com/dp/B0DGDFXVTG?tag=a9droid-20)

**Best for:** replacing a lost brick on a NUC-class mini PC **Skip it if:** your HTPC has an internal PSU bay

A lot of people running Plex or Kodi today aren't running a tower at all. They're running a NUC-class mini PC, and this is the part that fails or goes missing. Output is 19V at 3.42A, which is 65W, from a 100-240V 50-60Hz input with a positive tip.

Total cord length is 10 ft including the AC lead. That's the specification that decides whether the unit reaches the socket behind a TV cabinet without an extension. GRNPOWCN lists UL, FCC, CE and RoHS certification, the broadest safety marking in this group.

Compatibility is where the listing is unusually specific: Beelink EQ12, GMKtec Intel N100 and A8, GMKtec M5 Pro, BOSGAME P1, ACEMAGICIAN AM06PRO, Shuttle PE40, Intel NUC kits with i3, i5, Pentium, Celeron or Atom processors, and the Asus ADP-65DW-B. Match your model against that list before ordering.

A 1-year warranty is stated. Being fanless, it's silent by construction, which matters two feet from a subwoofer.

The limits are hard ones. 65W is the ceiling, so no discrete GPU. Barrel tip dimensions aren't published, and a 19V brick won't power a standard ATX motherboard at all. This is a replacement part, not a build component.

**Pros:**

- UL, FCC, CE and RoHS certified
- 10 ft total cable length
- Fanless, so completely silent
- Long named compatibility list
- 1-year warranty

**Cons:**

- 65W ceiling rules out any discrete GPU
- Barrel connector size not published
- Useless for a standard ATX motherboard
- No dimensions or weight listed

[Check Price on Amazon](https://www.amazon.com/dp/B0DGDFXVTG?tag=a9droid-20)

## 6\. ASHATA 12V ATX Power Supply — Best budget pick

**The cheapest route to a completely fanless media box, provided you already own a 12V adapter.**

[![ASHATA DC-ATX module on a 20-pin header — the fanless board that removes the last moving part from a media build](https://m.media-amazon.com/images/I/515AE5iD9sL._SL500_.jpg)](https://www.amazon.com/dp/B07RT87S83?tag=a9droid-20)

**Best for:** a fanless picoPSU-style build under 90W **Skip it if:** you don't already own a 12V DC adapter

Silence is the whole argument. At 0.63 x 1.81 x 1.38 in this is by some distance the smallest pick here, a bare DC-ATX board that mounts directly on the motherboard's 20-pin header and converts a single 12V input into the rails the board needs. No fan, no housing.

ASHATA rates the module at 90W and states plainly that it must be paired with a separate power adapter. That's the catch, and it's the reason this sits at the bottom of the ranking despite being the cheapest of the six. Buy this alone and you have a component, not a power supply.

Construction is described as industrial solid capacitors with a high heat tolerance, which ASHATA pitches at harsh environments. Solid capacitors are the sensible choice in a sealed fanless case where internal temperatures climb.

The intended targets are Mini-ITX and 1U chassis. In a genuinely low-power media build, 90W is workable.

Against every other pick, the documentation is thin: no rail amperages, no connector list beyond the 20-pin, no efficiency rating, no warranty. The 20-pin header also means a 24-pin board runs with four pins unpopulated. Check that your board tolerates it.

**Pros:**

- Cheapest of the six
- Completely fanless operation
- Smallest footprint at 0.63 x 1.81 x 1.38 in
- Industrial solid capacitors with high heat tolerance

**Cons:**

- Requires a separate 12V adapter you must supply
- 90W ceiling
- 20-pin only, not native 24-pin
- No warranty, efficiency rating or rail figures published
- No protection features stated

[Check Price on Amazon](https://www.amazon.com/dp/B07RT87S83?tag=a9droid-20)

## What more money buys across these six

The three price tiers here buy three genuinely different things, and only one of them is watts.

**Entry tier.** The ASHATA module and the GRNPOWCN brick occupy the two cheapest positions. What you get is a single conversion stage and silence: 90W and 65W respectively. What you don't get is a warranty on the ASHATA, or any published rail data on either. Both need something else in the chain to work.

**Middle tier.** The Apevia TFX-AP300W and the Logisys PS480D sit here. This is where you start getting a self-contained internal unit with its own fan, standard ATX wiring and named protections. The Apevia adds the full rail breakdown; the Logisys adds 180W.

**Premium tier.** The Apevia ITX-AP300W and the FSP FlexGURU Pro. Neither is the highest-wattage pick in the set, which makes the point: the extra money buys documentation and coverage. A 1-year warranty on one, five years and a Platinum efficiency claim on the other.

Spending more on a power supply for HTPC duty rarely buys watts you'll use. It buys the paperwork that tells you the unit will still work in year four.

## Fan noise in a living room: what the listings claim

Nobody wants a whine during a quiet scene. Here's what these six actually document, and where the gaps are.

Two picks are silent by design. The ASHATA module carries no fan at all, and the GRNPOWCN brick is a sealed external adapter.

Among the internal units, the Apevia TFX-AP300W has the largest fan at 80mm. Larger fans move the same air at lower RPM, which usually means less noise, though the listing publishes no acoustic figure. Both Flex ATX picks use 40mm fans. The Apevia ITX-AP300W adds thermal speed control; FSP specifies a two-ball-bearing 40mm fan, smart fan control and a shielding design, and claims near-silent operation. Ball bearings typically outlast sleeve bearings under continuous running, which is what an always-on media server does.

The Logisys PS480D publishes no fan specification whatsoever.

None of these six gives a decibel rating. That's the honest state of the data. If silence is non-negotiable, the fanless pair remove the variable entirely, and the FSP's combination of a controlled fan and high claimed efficiency is the strongest bet among the units that do have one.

## Connector counts and what they lock you out of

Wattage tells you nothing if the plugs don't match. Only two of these listings spell out their full harness, so this is the section to read before you order.

The Apevia ITX-AP300W is the most explicit: one 20/24-pin main, one 8-pin (4+4) CPU, two SATA, two Molex. That covers a board, a CPU and two drives. A third drive needs a splitter.

The Logisys PS480D gives a 24-pin with a detachable 4-pin section and a single 4-pin ATX12V. If your board wants an 8-pin CPU plug, that's a mismatch you cannot adapt around safely.

The ASHATA module is 20-pin. Many 24-pin boards accept a 20-pin plug in the correct alignment, but confirm yours does.

The Apevia TFX-AP300W and the FSP FlexGURU Pro don't publish counts, though the FSP's ATX 3.1 compliance implies current-generation wiring.

Two rules save most returns. Count your drives before you count watts, and photograph your existing plugs before the old unit comes out.

## What these listings do not tell you

Buying small-form-factor power is an exercise in reading around the gaps, and there are several.

- **Cable length.** Only the GRNPOWCN publishes it, at 10 ft total. In a tower where the PSU sits at the bottom and the CPU header at the top, a short harness is a genuine blocker, and none of the internal units say.
- **Efficiency.** One pick of six carries a certification. Everything else is unrated, which means you don't know how much of the draw becomes heat inside the case.
- **Warranty.** Three of six state one: five years on the FSP, one year each on the Apevia ITX and the GRNPOWCN. Three say nothing.
- **Rail distribution.** Only the Apevia TFX-AP300W publishes it. Two units both quote 300W total, but only one tells you 20A of it reaches +12V.
- **Seller depth.** Every one of these six is listed by a single seller. If a unit fails outside a stated warranty, there's no second source to fall back on.
- **Acoustic figures.** None. Fan diameter and bearing type are all you get.

Most shoppers miss the rail distribution point. Two supplies with the same badge number can behave very differently under a CPU load.

## The verdict

If your slim media case takes a TFX unit and you're running a CPU plus one or two drives, buy the Apevia TFX-AP300W. It's the only pick here that publishes its rail distribution, and +12V@20A with a stated 5% tolerance tells you far more about real behaviour than a badge wattage does. The 80mm fan is the largest cooling in this set, which is the right direction for a box sitting under a TV.

If your case takes Flex ATX and there's a discrete GPU, several tuners or a stack of drives in the plan, buy the FSP FlexGURU Pro 650W. Its exact advantage is coverage and headroom: 650W in the same 3.21 x 5.91 x 1.59 in footprint as a 300W competitor, an 80 PLUS Platinum claim at up to 92% efficiency, Japanese electrolytic capacitors, and a five-year warranty that is four years longer than anything else here.

The cutoff is roughly the moment a graphics card enters the build. Below it, 300W in the right shape is plenty and the extra spend buys nothing you'll notice. Above it, 300W isn't a saving, it's a ceiling. And if there's no internal bay at all because your HTPC is a mini PC, neither applies: the GRNPOWCN 19V adapter is the part you need.

## FAQ

### What is the best power supply for HTPC use if my case is very slim?

The best power supply for HTPC use in a very slim case is usually a TFX or Flex ATX unit. The Apevia TFX-AP300W measures 2.5 x 6.75 x 3.23 in; the FSP FlexGURU Pro and Apevia ITX-AP300W both measure 3.21 x 5.91 x 1.59 in. Measure your bay depth and bolt pattern first, because the two standards are not interchangeable.

### Is a premium HTPC power supply worth the extra spend?

A premium HTPC power supply is worth it when you want documentation and coverage rather than watts. The FSP FlexGURU Pro brings an 80 PLUS Platinum claim at up to 92% efficiency, Japanese electrolytic capacitors and a five-year warranty. For a box that idles under 60W and runs nightly, lower waste heat and long coverage matter more than the 650W figure.

### How many watts does a media PC actually need?

How many watts a media PC needs depends on whether a graphics card is involved. Without one, the 90W ASHATA module or the 65W GRNPOWCN adapter can be enough. With one, look at the Logisys PS480D at 480W or the FSP at 650W. What matters more is the +12V rail: the Apevia TFX-AP300W publishes 20A there, or 240W.

### Apevia TFX-AP300W or FSP FlexGURU Pro 650W: which should I pick?

Apevia TFX-AP300W or FSP FlexGURU Pro comes down to your chassis bracket and your load. The Apevia is TFX-shaped at 2.5 x 6.75 x 3.23 in and publishes its full rail breakdown. The FSP is Flex ATX at 3.21 x 5.91 x 1.59 in, carries a five-year warranty and doubles the output. Match the form factor, then decide on headroom.

### What mistake do first-time small-form-factor builders make most?

The mistake first-time small-form-factor builders make most is buying on wattage and ignoring connectors. The Logisys PS480D offers only a 4-pin ATX12V CPU plug, so an 8-pin board is a mismatch. The Apevia ITX-AP300W lists just two SATA ports. The ASHATA module is 20-pin and needs a separate 12V adapter you must buy yourself.

Start with a tape measure, not a wattage figure. Pull your existing unit, note the depth and bolt spacing, photograph every plug that comes out of it, then match that against the dimensions in the table above. For most slim media cases, the Apevia TFX-AP300W is the right default because it's the one pick that tells you exactly how its 300W is distributed, and a media box lives or dies on the +12V rail rather than the number printed on the label. If a graphics card is in the plan, or you want five years of warranty behind an always-on machine, step up to the FSP.

*Last updated: September 16, 2026\. Product availability re-checked.*

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