Buying Guide
The Best PC Power Supplies
Five ATX power supplies from 650W to 1200W for desktop PCs, including a white unit and two 1200W options.
By The PC Journal editorial team
12 min read5 products evaluated
A PC power supply should cover the whole system's draw with headroom. For most desktops that means 650W to 850W; workstations and high-end cards need 1000W or more.
We compared wattage, efficiency and warranty from each listing and Cybenetics data where listed; we did not test these units.
Quick Picks
Our 5 recommendations at a glance. Tap a pick for the full verdict.
Best PC Power Supply
be quiet! Power Zone 2 850W
850W Platinum with a 140mm fan and zero-RPM mode.
Best for: Most desktops.
Our take Check price for be quiet! Power Zone 2 850W (opens in a new tab)
Best 1200W Gold
ASRock Steel Legend SL-1200G
1200W with a ten-year warranty.
Best for: High-end workstations and gaming PCs.
Our take Check price for ASRock Steel Legend SL-1200G (opens in a new tab)
Best 750W Pick
be quiet! Pure Power 12 750W
750W Gold with three 8-pin PCIe cables.
Best for: Mid-range desktops.
Our take Check price for be quiet! Pure Power 12 750W (opens in a new tab)
Best 1200W Platinum
Super Flower Leadex VII XP PRO 1200W
1200W Platinum with Cybenetics Platinum.
Best for: Long-running heavy loads.
Our take Check price for Super Flower Leadex VII XP PRO 1200W (opens in a new tab)
Best White PSU
SAMA GT650 White
A white 650W unit with a zero-RPM mode.
Best for: White builds.
Our take Check price for SAMA GT650 White (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| 850W Platinum with a 140mm fan and zero-RPM mode. | Most desktops. | Check price for be quiet! Power Zone 2 850W (opens in a new tab) |
| 1200W with a ten-year warranty. | High-end workstations and gaming PCs. | Check price for ASRock Steel Legend SL-1200G (opens in a new tab) |
| 750W Gold with three 8-pin PCIe cables. | Mid-range desktops. | Check price for be quiet! Pure Power 12 750W (opens in a new tab) |
| 1200W Platinum with Cybenetics Platinum. | Long-running heavy loads. | Check price for Super Flower Leadex VII XP PRO 1200W (opens in a new tab) |
| A white 650W unit with a zero-RPM mode. | White builds. | Check price for SAMA GT650 White (opens in a new tab) |
Our Picks
Best PC Power Supply1 of 5
be quiet! Power Zone 2 850W on Amazon (opens in a new tab)
be quiet!'s Power Zone 2 850W carries Platinum ratings from both 80 Plus and Cybenetics, three PCIe 8-pin connectors and a native 12V-2x6.
Best for
- Most desktops.
Skip if
- Price-first buyers should look at the SAMA GT650 White, which cost less when we checked.
Why we like it
Its 140mm fan stops at low load. On rated output it sits mid-pack at 850W: the ASRock Steel Legend SL-1200G offers 1200W, and the SAMA GT650 White comes in at 650W. It shares a platinum 80 plus rating with the Super Flower Leadex VII XP PRO 1200W; the be quiet! Pure Power 12 750W goes with a gold 80 plus rating.
No depth is rated for the be quiet! Power Zone 2 850W, so check the maker's page against your case's PSU bay. On price it sat third of 5, between the cheaper be quiet! Pure Power 12 750W and the pricier ASRock Steel Legend SL-1200G, at the time of writing.
Key dimensions & specs
- Wattage: 850W
- Native 12V-2x6 cables: 1
- PCIe 8-pin connectors: 3
- 80 Plus rating: Platinum
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Fan: 140mm
- Fan stop: Yes
- Colour: Black
Pros
- A 850W rating
- A native 12V-2x6 cable for 16-pin cards
- 80 Plus Platinum efficiency
- ATX 3.1 compliance
Cons
- Costs more than the SAMA GT650 White at the time of writing
Best 1200W Gold2 of 5
ASRock Steel Legend SL-1200G on Amazon (opens in a new tab)
ASRock's Steel Legend SL-1200G is a 1200W ATX 3.1 unit with a native 12V-2x6 cable, a 10-year warranty and a Cybenetics LAMBDA A noise rating.
Best for
- High-end workstations and gaming PCs.
Skip if
- Skip it if price comes first: the SAMA GT650 White cost less when we checked.
Why we like it
It uses 100% Japanese capacitors for longevity and stable output. Check your case and component specifications before buying. It matches the Super Flower Leadex VII XP PRO 1200W on rated output (1200W).
Like the be quiet! Pure Power 12 750W, it has a gold 80 plus rating, while the be quiet! Power Zone 2 850W uses a platinum 80 plus rating. It also comes with a 5V boost function for stable standby voltage. No depth is rated for the ASRock Steel Legend SL-1200G, so check the maker's page against your case's PSU bay.
When we checked, only the be quiet! Power Zone 2 850W and cheaper picks cost less, and the Super Flower Leadex VII XP PRO 1200W cost more. If you want a confirmed 8-pin PCIe connector count, look to the be quiet! Power Zone 2 850W instead: it offers 3, while this one gives no figure.
Key dimensions & specs
- Wattage: 1200W
- Native 12V-2x6 cables: 1
- Warranty: 10 years
- 80 Plus rating: Gold
- Cybenetics rating: Platinum
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 135mm
- Colour: Black
Pros
- 1200W of rated output for high-power cards
- A native 12V-2x6 cable for 16-pin cards
- A 10-year warranty
- ATX 3.1 compliance
Cons
- Costs more than the SAMA GT650 White at the time of writing
Best 750W Pick3 of 5
be quiet! Pure Power 12 750W on Amazon (opens in a new tab)
be quiet!'s Pure Power 12 750W pairs a native 12V-2x6 with three PCIe 8-pin connectors, cooled by a temperature-controlled 120mm fan.
Best for
- Mid-range desktops.
Skip if
- If budget leads, the SAMA GT650 White was cheaper at our last price check.
Why we like it
Its airflow-optimised fan blades reduce turbulence, which helps keep it quiet under a gaming load. It suits a mid-range build that still uses an 8-pin graphics card, and be quiet! designs it to handle short power excursions from the GPU. Its 750W rated output ranks fourth of 5 here, behind the ASRock Steel Legend SL-1200G (1200W) and ahead of the SAMA GT650 White (650W).
Like the ASRock Steel Legend SL-1200G, it has a gold 80 plus rating, while the be quiet! Power Zone 2 850W uses a platinum 80 plus rating. No depth is rated for the be quiet! Pure Power 12 750W, so check the maker's page against your case's PSU bay. It was priced above the SAMA GT650 White and below the be quiet! Power Zone 2 850W at the time of writing.
Key dimensions & specs
- Wattage: 750W
- Native 12V-2x6 cables: 1
- PCIe 8-pin connectors: 3
- 80 Plus rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Fan: 120mm
- Colour: Black
Pros
- A 750W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Temperature-controlled 120mm be quiet! fan
Cons
- Costs more than the SAMA GT650 White at the time of writing
Best 1200W Platinum4 of 5
Super Flower Leadex VII XP PRO 1200W on Amazon (opens in a new tab)
Super Flower's Leadex VII XP PRO 1200W carries Platinum ratings from both 80 Plus and Cybenetics.
Best for
- Long-running heavy loads.
Skip if
- Skip it if price comes first: the SAMA GT650 White cost less when we checked.
Why we like it
The maker specifies voltage regulation within 0.5% on the main rails and flexible ribbon cables. It is Cybenetics Platinum and 80 Plus Platinum, and all cables are ribbon-style for flexibility. It matches the ASRock Steel Legend SL-1200G on rated output (1200W).
Like the be quiet! Power Zone 2 850W, it has a platinum 80 plus rating, while the ASRock Steel Legend SL-1200G uses a gold 80 plus rating. The Super Flower Leadex VII XP PRO 1200W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. At our last price check it topped the group, with the ASRock Steel Legend SL-1200G the nearest cheaper option. If you want a confirmed 8-pin PCIe connector count, look to the be quiet! Power Zone 2 850W instead: it offers 3, while this one gives no figure.
Key dimensions & specs
- Wattage: 1200W
- Native 12V-2x6 cables: 1
- 80 Plus rating: Platinum
- Cybenetics rating: Platinum
- Form factor: ATX
- Cabling: Fully modular
- Colour: Black
Pros
- 1200W of rated output for high-power cards
- A native 12V-2x6 cable for 16-pin cards
- 80 Plus Platinum efficiency
- Fully modular cables
Cons
- Costs more than the SAMA GT650 White at the time of writing
Best White PSU5 of 5
SAMA GT650 White on Amazon (opens in a new tab)
SAMA's GT650 White is a fully modular white unit with embossed white cables, a native 12V-2x6 cable and an ECO silent mode.
Best for
- White builds.
Skip if
- Skip it if rated output matters most to you; the ASRock Steel Legend SL-1200G offers 1200W.
Why we like it
Japanese capacitors support long-term durability, and a native 12V-2x6 connector feeds current graphics cards. It is 80 Plus Gold rated. On rated output it trails the group at 650W, while the ASRock Steel Legend SL-1200G offers 1200W.
A white colour is unique to it among these picks, while the ASRock Steel Legend SL-1200G uses a black colour. The SAMA GT650 White comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the SAMA GT650 White, so check the maker's page against your case's PSU bay. It was the cheapest of the group when we checked; the be quiet! Pure Power 12 750W was the next step up.
Key dimensions & specs
- Wattage: 650W
- Native 12V-2x6 cables: 1
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 120mm
- Fan stop: Yes
- Colour: White
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Fully modular cables
Cons
- Rated output trails the ASRock Steel Legend SL-1200G (1200W)
How We Chose These PC Power Supplies
Each pick was assessed across 4 criteria weighted for real-world use.
- Build and warranty
- We checked depth, modular cabling, fan-stop modes and warranty length.
- Wattage
- We compared rated output with NVIDIA's or AMD's recommended system power for the card.
- Connectors
- We recorded native 12V-2x6 cables and PCIe 8-pin connectors where the listing states them.
- Price
- We grouped picks by price at the time of writing.
What to Look for in PC Power Supplies
Key buying criteria so you get the right fit the first time.
Start from the card maker's PSU figure
NVIDIA and AMD publish a recommended total system power for each card, and partner cards often state their own. Treat that figure as the floor, then add headroom for a high-power CPU.
More wattage than you need does not harm anything; it mostly costs money.
Compare efficiency ratings
80 Plus and Cybenetics ratings describe how much power turns into heat. Gold is the usual target for a gaming PC; Platinum and Titanium run cooler and cost more.
Use the warranty as a quality signal
Long warranties of seven to twelve years show how long a maker expects a unit to last. A power supply often moves from one build to the next, so the warranty matters.
Check depth and cabling
Deeper units can clash with drive cages or front radiators. Fully modular cables make routing easier in tight cases.
Prefer ATX 3.1
ATX 3.1 units are designed for the brief power spikes modern graphics cards produce and ship with the revised 12V-2x6 connector. Older units can still work, but check the maker's guidance for your card.
Match the power connector
Most RTX 40 and RTX 50 cards use a single 16-pin 12V-2x6 (12VHPWR) plug, while many Radeon cards use two or three 8-pin plugs. A native cable avoids bulky adapters.
Push the 16-pin plug fully home and avoid a sharp bend right at the connector.
How to Choose PC Power Supplies
By priority
| Priority | Consider | Why |
|---|---|---|
| Most desktops | be quiet! Power Zone 2 850W | 850W Platinum with a 140mm fan and zero-RPM mode |
| High-end workstations and gaming PCs | ASRock Steel Legend SL-1200G | 1200W with a ten-year warranty |
| Mid-range desktops | be quiet! Pure Power 12 750W | 750W Gold with three 8-pin PCIe cables |
| Long-running heavy loads | Super Flower Leadex VII XP PRO 1200W | 1200W Platinum with Cybenetics Platinum |
| White builds | SAMA GT650 White | A white 650W unit with a zero-RPM mode |
Scroll sideways to see every column.
Key specs side by side
Figures as each maker states them.
| Power supplie | Wattage | Native 12V-2x6 cables | PCIe 8-pin connectors | 80 Plus rating |
|---|---|---|---|---|
| be quiet! Power Zone 2 850W | 850W | 1 | 3 | Platinum |
| ASRock Steel Legend SL-1200G | 1200W | 1 | Not listed | Gold |
| be quiet! Pure Power 12 750W | 750W | 1 | 3 | Gold |
| Super Flower Leadex VII XP PRO 1200W | 1200W | 1 | Not listed | Platinum |
| SAMA GT650 White | 650W | 1 | Not listed | Not listed |
Scroll sideways to see every column.
By price at the time of writing
Prices change often; these tiers reflect Amazon prices when this guide was updated.
| Price tier | Power supplies |
|---|---|
| About $50 to $100 | SAMA GT650 White, be quiet! Pure Power 12 750W |
| About $100 to $150 | be quiet! Power Zone 2 850W, ASRock Steel Legend SL-1200G |
| About $150 to $250 | Super Flower Leadex VII XP PRO 1200W |
Frequently Asked Questions
How much headroom should I leave above the recommended wattage?
The card maker's figure already covers a typical system. Add 100 to 150W if you run a high-power CPU or plan a bigger card later.
Is an ATX 3.0 power supply still fine?
Generally yes. ATX 3.1 mainly revises the connector to 12V-2x6 and relaxes some spike requirements; check your unit's cable is rated for your card.
Can I use an SFX power supply?
Yes, if the case supports SFX and the unit meets the wattage and connector needs of your card. SFX units cost more per watt.
Can I use the 16-pin adapter that came with my graphics card?
Yes, if it is the maker's own adapter and every 8-pin plug on it is connected. A native 12V-2x6 cable is tidier and has fewer joins.
Does a Platinum unit save much on electricity?
Only a little for most gaming PCs. The main gains are less heat and often a quieter fan.
Can I reuse the power supply from my old PC?
Only if it meets the card's wattage and connector needs and is still under warranty or in good health. Very old units lack modern connectors.
Bottom Line
The be quiet! Power Zone 2 850W suits most desktops, and the ASRock SL-1200G covers high-end systems. The Pure Power 12 750W suits mid-range PCs, the Leadex VII XP PRO is the Platinum 1200W pick, and the SAMA GT650 White suits white builds.