Best Compact SFX Power Supply: Apevia AP500W Leads

The best compact SFX power supply in this set is the Apevia SFX-AP500W, a 500W unit that measures 2.5 x 4.92 x 3.94 in and carries the full connector spread a single-GPU mini-ITX build needs. If your build targets a current-gen GPU with a 12V-2x6 plug, the Corsair SF1000 is the better buy at 1000W with ATX 3.1 and PCIe 5.1 compliance in the same 2.5 x 4.92 x 3.94 in footprint.

Best compact SFX power supply at a glance

How I screened these six SFX units

I started with the internal power supplies category and pulled listings whose published dimensions fit a small-form-factor chassis. Anything with a depth over 4 inches on the shortest side went into a separate pile, because a true SFX bay is 125mm deep and a unit that only sits inside a mini-ITX case via an adapter bracket is a different product.

Two of these six are edge cases and I have kept them in on purpose. The Rosewill VNW 750W measures 3.38 x 5.9 x 5.51 in, which is a compact ATX footprint rather than a strict SFX one. The FSP SFX Pro ships with an SFX-to-ATX adapter bracket, so it works in both worlds. Everything else lands at a 2.5 in shortest side, which is the SFX standard.

I compared what the listings actually publish: rated wattage, dimensions, warranty length, efficiency rating and connector spread. Cable style, fan size and standards compliance came next. I did not weigh price into the ranking directly, because a compact SFX power supply is bought around a chassis, not a budget.

What actually decides a compact SFX power supply?

Most compact SFX power supply guides lead with efficiency ratings. That is not what decides it in a small chassis. Two things do: the depth the case will accept, and whether the connectors match the parts you already own.

The efficiency rating tells you how much of the wall power ends up as heat inside a case that has almost no room for heat. It matters at the extremes, and less in the middle:

1. Depth first. Every one of these six except the Rosewill lands at 2.5 in on its shortest side, which is the SFX-standard 63.5mm. The Super Flower goes further with a 3.93 in second dimension, the shortest overall footprint here. If your chassis specifies SFX, anything larger than 125mm on the long side will foul the bracket.
2. Then wattage headroom. A modern GPU can pull well over 300W in transient spikes, and a compact case cannot dissipate the extra heat of a unit running near 100%. Aim for a rated wattage that sits comfortably above the sum of your parts under load.
3. Then the connectors. The Corsair SF1000 and the Super Flower Combat are the only two picks here that publish ATX 3.1 and PCIe 5.1 compliance, which is what current-gen GPUs with a 12V-2x6 plug expect. The four cheaper units use the older PCIe 6/8 pin standard.

1. Apevia SFX-AP500W — Best overall

A 500W SFX unit with a full single-GPU connector spread at the entry tier, and the second-cheapest here.

Best for: a standard mini-ITX build with a single mid-range GPU Skip it if: you need modular cables or an ATX 3.1 12V-2x6 connector

The Apevia SFX-AP500W wins the top slot because it hits the specification a mainstream small-form-factor build actually needs, at the second-lowest price position in this set. Dimensions are 2.5 x 4.92 x 3.94 in, which Apevia lists as the SFX-standard 125 x 100 x 63.5mm, so it drops into any chassis marked SFX without adapters.

Apevia's listing describes the connector spread as one 20+4 pin main, one 8 pin CPU (which splits to 4+4), one 6/8 pin PCIe, three SATA and two 4 pin Molex. That covers a single mid-range GPU plus a handful of drives, which is the shape of most mini-ITX builds. The 8 pin CPU splits into 4+4 for older boards, per Apevia's own description.

Two trade-offs stand out against the rest of the set. The warranty runs one year, tied with the Apevia 400W for the shortest here, next to the Corsair's seven years and the Super Flower's ten. Cabling is not modular either. If your case has tight cable clearance behind the tray, the Corsair or the Super Flower will tidy up more easily.

Pros:

• Standard 2.5 x 4.92 x 3.94 in SFX footprint
• Full single-GPU connector set from a 500W rating
• Second-cheapest of the six here
• 8 pin CPU splits to 4+4 for older boards
• Three SATA plus two Molex for storage flexibility

Cons:

• 1 year warranty, the shortest in this set
• Non-modular cables
• No ATX 3.1 or PCIe 5.1 compliance stated
• No published 80 Plus rating on the listing

2. Corsair SF1000 (2024) — Best premium

A 1000W SFX unit with ATX 3.1 and PCIe 5.1 compliance in the same 2.5 in depth as the entry-level picks.

Best for: a high-end small-form-factor PC with a current-gen GPU Skip it if: your build draws under 500W and you want to save money

The Corsair SF1000 is the only unit in this set that pairs 1000W with the standard SFX footprint of 2.5 x 4.92 x 3.94 in. That combination is what makes a compact chassis with a flagship GPU possible. Corsair lists the unit as 80 Plus Platinum rated, ATX 3.1 compliant and PCIe 5.1 ready, with 105°C rated Japanese capacitors and a 92mm PWM fan on a fluid dynamic bearing.

Cabling is fully modular, which matters more here than on any other pick in this set: 1000W of connectors is a lot of wire to hide in a mini-ITX case, and unplugging the ones you do not need is the only real answer. Corsair uses Type-5 Micro-Fit connectors on the PSU side.

Warranty is 7 years, second only to the Super Flower's 10 years. The obvious cost is that this is the most expensive pick here, and by a clear margin. If your build sits around 400 to 500W under load, you are buying capacity you will not draw and paying for the platinum rating and the 12V-2x6 support you do not need yet.

Pros:

• 1000W in a 2.5 x 4.92 x 3.94 in SFX body
• ATX 3.1 and PCIe 5.1 ready per Corsair
• 80 Plus Platinum rated
• Fully modular Type-5 Micro-Fit cabling
• 7 year manufacturer warranty
• 92mm PWM fluid dynamic bearing fan

Cons:

• The most expensive pick in this set
• Overkill for builds under about 500W
• Micro-Fit connectors may not match older third-party cables

3. FSP SFX Pro 450W — Runner-up

A 450W SFX unit with a bundled SFX-to-ATX bracket and an 80 Plus Bronze certification, at a mid-tier price.

Best for: a modest SFX build that will also be moved into a larger case later Skip it if: you need more than 450W or want modular cables

The FSP SFX Pro 450W is the pick for someone who is not sure yet whether the next case will be mini-ITX or a compact micro-ATX. Dimensions are 2.5 x 5 x 4 in and FSP includes an SFX-to-ATX adapter bracket in the box, so the same unit slots into either format without extra parts. Weight is 2.69 lb, near the middle of this set.

Efficiency is 80 Plus Bronze certified, one step below the platinum-rated Corsair and gold-rated Super Flower. FSP describes the design as DC-to-DC with an intelligent sleeve fan that ramps with load, and the cabling as all-black ribbon cables tailored for compact cases. Cables are fixed rather than modular.

Warranty runs 3 years, which sits above both Apevias and below the Rosewill, Corsair and Super Flower. The obvious trade against the top pick is capacity. At 450W it is 50W lighter than the Apevia SFX-AP500W and it is a more expensive unit, so it earns its slot on efficiency, warranty and that adapter bracket rather than on watts alone.

Pros:

• SFX-to-ATX adapter bracket included
• 80 Plus Bronze efficiency
• 3 year warranty
• All-black ribbon cables for tight cases
• DC-to-DC design per FSP

Cons:

• 450W caps the GPU it can pair with
• Non-modular cabling
• Costs more than the higher-rated Apevia 500W
• Only one seller lists it

4. Super Flower Combat SFX FG 850W — Best for small spaces

The shortest overall footprint in this set at 3.93 in on the second dimension, paired with 850W and a 10 year warranty.

Best for: a compact chassis where the shortest depth matters most Skip it if: you want an established brand with wide retailer support

The Super Flower Combat SFX FG 850W posts the tightest published dimensions here: 2.5 x 3.93 x 4.92 in. Every other SFX-standard unit in this set is 3.94 in on that second dimension. The 0.01 in difference is trivial for most cases and meaningful for a handful of tight sandwich-layout mini-ITX chassis, which is where this unit earns its label.

Super Flower lists the design as fully modular with all-ribbon cables, ATX 3.1 compliant and PCIe 5.1 ready, Cybenetics Gold certified and 100V to 240V full-range auto-voltage. Weight is 3.7 lb, the heaviest in the set, which reflects the capacitor and heat-sink content behind an 850W rating.

The warranty at 10 years is the longest of the six, edging the Corsair's 7 years. Trade-offs are real. Only one seller lists it on Amazon per the listing, so replacement channels are thinner than for Corsair or FSP, and the brand is less familiar to first-time builders. If those things matter to you, the Corsair is the safer platinum-tier buy.

Pros:

• Shortest overall footprint at 2.5 x 3.93 x 4.92 in
• ATX 3.1 and PCIe 5.1 ready per Super Flower
• Cybenetics Gold certified
• Fully modular ribbon cables
• 10 year warranty, the longest here

Cons:

• Only one seller lists it
• Less familiar brand than Corsair or FSP
• Heaviest unit in this set at 3.7 lb
• 850W is more than most mini-ITX builds need

5. Rosewill VNW 750W — Best for beginners

A compact ATX unit with a 5 year warranty and a 120mm fluid dynamic bearing fan, aimed at first-time builders.

Best for: a first small-form-factor build in a case that accepts a compact ATX unit Skip it if: your chassis is strictly SFX-only

The Rosewill VNW 750W is the outlier in this set. Dimensions are 3.38 x 5.9 x 5.51 in, which is a compact ATX body rather than a true SFX one. Rosewill describes it as a 140 x 150 x 86mm chassis, so it fits in the smaller end of ATX case cutouts and in the compact-ATX bays some micro-ATX cases use. It will not fit an SFX bracket.

That caveat aside, the specification sheet is friendly to a first build. 750W is enough for a mid-to-upper mainstream GPU with headroom, the warranty runs 5 years, and Rosewill highlights a 120mm fluid dynamic bearing fan alongside a five-way protection suite covering UVP, OVP, OPP, SCP and OCP. Efficiency is 80 Plus White per Rosewill's listing, the lowest rating in this set.

Cabling is non-modular. The trade-off against the other picks here is form factor: if your case explicitly requires SFX, this one is off the table regardless of how well it reads. In a compact ATX case, though, it is the beginner-friendly pick with the longer warranty.

Pros:

• 5 year warranty
• 120mm FDB fan for quieter operation
• Five-way protection suite listed
• 750W handles most mainstream GPUs
• Larger fan runs slower than SFX 80mm designs

Cons:

• 3.38 in depth means it is not true SFX
• 80 Plus White is the lowest efficiency rating here
• Non-modular cables
• Will not fit strict SFX bays

6. Apevia SFX-AP400W — Best budget pick

The cheapest of the six, a 400W SFX unit for low-power secondary builds.

Best for: a low-power secondary or office build Skip it if: you plan to add a discrete GPU with a 6+2 pin plus a second connector

The Apevia SFX-AP400W is the cheapest pick in the set and the one to reach for when the build in question does not have a hungry GPU. Dimensions are 2.5 x 5 x 4 in and weight is 2.03 lb, the lightest here. Apevia lists 400W of rated capacity with one 20+4 pin main, one 4 pin CPU, one 6/8 pin PCIe, two SATA, two Molex and a legacy 4 pin floppy plug. Cooling is a single 80mm thermally controlled fan.

The rail figures Apevia publishes are +3.3V at 12A, +5V at 12A, +12V at 28A, -12V at 0.3A and +5Vsb at 2.5A. That +12V figure caps what a discrete GPU can safely pull, so this unit suits integrated graphics or a low-power discrete card rather than a modern gaming setup.

Warranty is 1 year, tied with the AP500W. The right way to think of this pick is as a specification-appropriate budget: for a home-office SFX build or a secondary machine, paying for 500W or more is money you will not use. For anything more ambitious, the AP500W a step up the range is the better default.

Pros:

• Cheapest pick in this set
• Standard SFX footprint on the 2.5 in side
• Lightest unit here at 2.03 lb
• Covers the main, CPU, PCIe, SATA and Molex basics

Cons:

• 400W caps discrete-GPU choices
• One CPU 4 pin only, no 4+4 split
• Only two SATA connectors
• 1 year warranty and non-modular cables

SFX vs SFX-L: does the extra depth matter?

Five of these six units land at 2.5 in on their shortest side, which corresponds to the 63.5mm SFX standard. The Rosewill VNW 750W is the exception at 3.38 in, and it is not an SFX unit in the strict sense. Your case decides which of those matters.

Compatibility, in one paragraph. A chassis marked SFX will accept any of the five true SFX units in this set. A chassis marked SFX-L will accept the same five plus longer variants, so an SFX unit fits an SFX-L bay with room to spare, and the reverse is not true. The Rosewill fits neither bracket and expects a compact ATX cutout.

The Super Flower is worth calling out here. Its 2.5 x 3.93 x 4.92 in listed dimensions post the tightest overall footprint in the set on the second axis. In a sandwich-layout mini-ITX case where the GPU sits directly next to the PSU, that fraction of an inch can be the difference between clearance and an angled cable. In a more conventional chassis it is a wash.

How much wattage does a small-form-factor build really need?

Enough headroom that the fan does not spin up under load, and no more than that. In a compact case, capacity you do not use costs money and space, but capacity you exceed causes crashes.

• Integrated graphics or low-power discrete card: the Apevia SFX-AP400W's 400W covers this comfortably.
• Single mid-range GPU (roughly a 60-tier card): the Apevia SFX-AP500W at 500W or the FSP SFX Pro at 450W is the right band.
• Higher-tier single GPU (a 70- or 80-tier card): step up to the Rosewill's 750W in compact ATX or the Super Flower's 850W in true SFX.
• Current-gen flagship GPU with a 12V-2x6 plug: the Corsair SF1000 at 1000W with ATX 3.1 compliance is the pick.

Two connector notes shift the calculation. First, only the Corsair and the Super Flower publish ATX 3.1 and PCIe 5.1 compliance, so a card that ships with a 12V-2x6 native connector will pair cleanest with one of those two. Second, the Apevia SFX-AP400W lists a single 4 pin CPU connector without a 4+4 split, so motherboards that require an 8 pin CPU plug will need the AP500W or higher.

What the listings do not tell you

Product listings are marketing copy plus a specification table, and neither tells you everything a builder wants to know before parts arrive.

• Cable stiffness. Ribbon cables are advertised across four of these six picks and they are genuinely easier to route than round sleeved cables, but they still take up volume in a mini-ITX case. Assume you will need to plan for the shortest run possible.
• Fan behaviour at idle. Only the FSP and the Corsair explicitly describe temperature-controlled fan behaviour. The others may or may not run the fan at low load; the listings do not commit.
• Included cable set with modular units. The Corsair and the Super Flower are fully modular. The listings describe the connector spread but not necessarily the exact bag of cables in the box, so verify against the manufacturer's product page before you plan a build around a specific plug.
• Actual noise levels. Fan size and bearing type get published; measured dB figures do not. Larger fans generally run slower for the same airflow, which is why the Rosewill's 120mm design has an acoustic edge in principle over the 80mm and 92mm units here.

The pattern is simple: the listings are strongest on numbers you can compare in a table, and weakest on the experience of installing and living with the unit. Treat the specification sheet as necessary rather than sufficient.

Which pick fits which build?

Match the build to the pick rather than the other way round. Six short scenarios cover most compact SFX power supply decisions:

1. Mid-range mini-ITX gaming rig with a single GPU: the Apevia SFX-AP500W.
2. Flagship mini-ITX build with a current-gen GPU: the Corsair SF1000.
3. Compact office or productivity build with integrated graphics: the Apevia SFX-AP400W.
4. Modest SFX build that may migrate to a larger case later: the FSP SFX Pro 450W with its bundled ATX bracket.
5. Sandwich-layout mini-ITX where every millimetre matters: the Super Flower Combat SFX FG 850W.
6. First build in a compact ATX case rather than a true SFX one: the Rosewill VNW 750W.

If the modifier that brought you here was strictly compact, the Rosewill sits at the outer edge of that word. It is compact for an ATX unit, not compact by SFX standards. Read the case specification before you commit; the difference between an SFX bay and a compact ATX cutout is the difference between a bracket that fits and one that does not.

The verdict

At the entry tier, the best compact SFX power supply is the Apevia SFX-AP500W. 500W of rated capacity, standard SFX dimensions of 2.5 x 4.92 x 3.94 in, and a connector spread that includes a 4+4 CPU split plus a 6/8 pin PCIe covers the mainstream single-GPU mini-ITX build without paying for capacity or standards a mid-range card cannot use. The 1 year warranty is the price you pay for it.

In the middle of the range, the FSP SFX Pro 450W earns the runner-up label on efficiency, warranty and its bundled SFX-to-ATX bracket, and the Rosewill VNW 750W is the beginner-friendly compact ATX option for cases that will accept it.

At the premium tier, the Corsair SF1000 is the pick. 1000W, ATX 3.1 and PCIe 5.1 compliance, 80 Plus Platinum efficiency, fully modular cabling and a 7 year warranty inside the same 2.5 in depth as the entry-level Apevia. The Super Flower Combat is the alternative for the tightest sandwich-layout cases, trading brand familiarity for a shorter second axis and the longest warranty in the set at 10 years.

FAQ

Is 500W enough for a compact SFX power supply build?

500W is enough for a compact SFX build with a single mid-range GPU, a mainstream CPU and a handful of drives, which is the shape most mini-ITX rigs take. The Apevia SFX-AP500W sits at that rating with a 6/8 pin PCIe plus a 4+4 CPU connector. Step up to 750W or more for a higher-tier GPU or a current-gen card with a 12V-2x6 plug.

Is the Corsair SF1000 worth it over the Apevia SFX-AP500W?

The Corsair SF1000 is worth it over the Apevia if your build is aimed at a current-gen flagship GPU or you want future-proofing. You get 1000W versus 500W, ATX 3.1 and PCIe 5.1 compliance, 80 Plus Platinum, fully modular cabling and a 7 year warranty against the Apevia's 1 year. For a mid-range single-GPU build, the Apevia's specification is a closer match to the parts.

What is the difference between SFX and SFX-L in a power supply?

The difference between SFX and SFX-L is depth along the long axis. Five of the six picks here land at 2.5 x 4.92 x 3.94 in, which is standard SFX. SFX-L units run longer to accommodate a bigger fan. An SFX unit fits an SFX-L bay with room to spare; an SFX-L unit will not fit a strict SFX bay. Check the case specification before ordering.

Which is quieter, the Rosewill VNW 750W or the FSP SFX Pro?

The Rosewill VNW 750W is likely quieter than the FSP SFX Pro at comparable load because it uses a larger 120mm fluid dynamic bearing fan versus the FSP's sleeve fan in a smaller SFX chassis. Neither listing publishes measured decibel figures, so this is a physics-based inference rather than a tested claim. The Rosewill is only relevant if your case accepts a compact ATX unit rather than strict SFX.

What connectors do I need for a modern GPU on a compact SFX power supply?

For a current-gen flagship GPU you need a 12V-2x6 (or 12VHPWR) connector, which ATX 3.1 supplies natively. In this set, only the Corsair SF1000 and the Super Flower Combat publish ATX 3.1 and PCIe 5.1 compliance. Older or lower-tier cards use one or two PCIe 6+2 pin plugs, which the Apevia SFX-AP500W, the FSP SFX Pro and the Rosewill VNW all provide.

Ready to pick? Start with the Apevia SFX-AP500W if your build is a mainstream single-GPU mini-ITX rig; that 2.5 x 4.92 x 3.94 in body with a 4+4 CPU split and a 6/8 pin PCIe is the specification a mid-range compact SFX power supply build actually asks for. If you are building around a current-gen flagship card, the Corsair SF1000 buys you ATX 3.1 compliance, seven-year cover and modular cabling in the same depth. Match the case to the unit before the parts ship, and you will not need to open the build twice.

Last updated: September 26, 2026. Product availability re-checked.

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