Buying Guide
The Best Power Supplies for the RTX 4070 and 4070 Super
Six 650W and 750W units for the RTX 4070 and 4070 Super, which NVIDIA pairs with 650W, including an SFX option.
By Alex Morgan, PC Hardware Editor
12 min read6 products evaluated
NVIDIA recommends a 650W power supply for both the RTX 4070 and the RTX 4070 Super. Many partner cards use a 16-pin connector, though some RTX 4070 models use an 8-pin plug.
We compared wattage, connectors and ratings from the power supply listings against the card maker's guidance; we did not load-test these units.
Quick Picks
Which of the 6 picks to look at first. Tap a name for the full analysis.
Best Match for an RTX 4070
be quiet! Pure Power 12 650W650W with a native 12V-2x6 and a single strong 12V rail.
Best for: Most RTX 4070 builds.
Check price for be quiet! Pure Power 12 650W on Amazon (opens in a new tab)
Best Warranty Value
MONTECH Century II 650WA 10-year warranty on a low-cost 650W unit.
Best for: Budget builds.
Check price for MONTECH Century II 650W on Amazon (opens in a new tab)
Best Cable Kit
Seasonic CORE GX-650 (ATX 3.1)A 12V-2x6 to dual 8-pin cable in the box.
Best for: Cards with 8-pin plugs.
Check price for Seasonic CORE GX-650 (ATX 3.1) on Amazon (opens in a new tab)
Best Budget 750W
SAMA GT750750W with Japanese capacitors.
Best for: Headroom on a budget.
Check price for SAMA GT750 on Amazon (opens in a new tab)
Best SFX Pick
Cooler Master V750 SFX GoldAn SFX unit with a 90-degree 12V-2x6 cable.
Best for: Small form factor builds.
Check price for Cooler Master V750 SFX Gold on Amazon (opens in a new tab)Best 750W be quiet! Pick
be quiet! Pure Power 12 750WThree PCIe 8-pin connectors plus a 12V-2x6.
Best for: Future card upgrades.
Check price for be quiet! Pure Power 12 750W on Amazon (opens in a new tab)
Our Picks
Best Match for an RTX 40701 of 6
be quiet! Pure Power 12 650W
be quiet!'s Pure Power 12 650W has a native 12V-2x6, two PCIe 8-pin connectors and a single strong 12V rail.
Best for
- Most RTX 4070 builds.
Skip if
- If budget leads, the SAMA GT750 was cheaper at our last price check.
Why we like it
It is 80 Plus Gold rated at up to 92.7% efficiency, and LLC topology gives tight voltage regulation. The 120mm fan is temperature-controlled. One 12V rail handles short GPU power excursions.
It matches the MONTECH Century II 650W and the Seasonic CORE GX-650 on rated output (650W). No depth is rated for the be quiet! Pure Power 12 650W, so check the maker's page against your case's PSU bay. You also get this: ATX 3.1 compliance. It was priced above the MONTECH Century II 650W and below the be quiet! Pure Power 12 750W at the time of writing.
Key specs
- Wattage
- 650W
- Native 12V-2x6 cables
- 1
- PCIe 8-pin connectors
- 2
- 80 Plus rating
- Gold
- ATX version
- ATX 3.1
- Form factor
- ATX
- Fan
- 120mm
- Colour
- Black
Pros
- A 650W 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 GT750 at the time of writing
Best Warranty Value2 of 6
MONTECH Century II 650W
Montech's Century II 650W brings a native 12V-2x6 cable, fully modular cables and a 10-year warranty to a low-cost 80 Plus Gold unit.
Best for
- Budget builds.
Skip if
- Skip it if price comes first: the SAMA GT750 cost less when we checked.
Why we like it
Its 135mm FDB fan has a zero RPM mode, and it uses 100% Japanese capacitors. It matches the be quiet! Pure Power 12 650W and the Seasonic CORE GX-650 on rated output (650W). The MONTECH Century II 650W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.
No depth is rated for the MONTECH Century II 650W, so check the maker's page against your case's PSU bay. It was priced above the SAMA GT750 and below the be quiet! Pure Power 12 650W at the time of writing. There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 12 750W offers 3.
Key specs
- Wattage
- 650W
- Native 12V-2x6 cables
- 1
- Warranty
- 10 years
- 80 Plus rating
- Gold
- ATX version
- ATX 3.1
- Form factor
- ATX
- Cabling
- Fully modular
- Fan
- 135mm
- Fan stop
- Yes
- Colour
- Black
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- A 10-year warranty
- ATX 3.1 compliance
Cons
- Costs more than the SAMA GT750 at the time of writing
Best Cable Kit3 of 6
Seasonic CORE GX-650 (ATX 3.1)
Seasonic's CORE GX-650 ships with a native 12V-2x6 cable and a 12V-2x6 to dual 8-pin cable, with Seasonic's OptiSink heat-dissipation design.
Best for
- Cards with 8-pin plugs.
Skip if
- Skip it if rated output matters most to you; the SAMA GT750 offers 750W.
Why we like it
It is 80 Plus Gold and listed as ready for the RTX 5060 Ti and RX 9000 cards. On rated output it ties with the be quiet! Pure Power 12 650W and the MONTECH Century II 650W at 650W. No depth is rated for the Seasonic CORE GX-650, so check the maker's page against your case's PSU bay.
Another plus: ATX 3.1 compliance. Its price falls between the be quiet! Pure Power 12 750W and the Cooler Master V750 SFX Gold, based on our last check. If rated output is your priority, the SAMA GT750 (750W) is the stronger choice.
Key specs
- Wattage
- 650W
- Native 12V-2x6 cables
- 1
- 80 Plus rating
- Gold
- ATX version
- ATX 3.1
- Form factor
- ATX
- Colour
- Black
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- 12V-2x6 to dual 8-pin cable in the box
Cons
- Rated output trails the SAMA GT750 (750W)
- Costs more than the SAMA GT750 at the time of writing
Best Budget 750W4 of 6
SAMA GT750
SAMA's GT750 uses Japanese capacitors with an LLC and DC-DC design, a native 12V-2x6 cable and an ECO silent mode for low loads.
Best for
- Headroom on a budget.
Skip if
- Look at the other picks if you need a feature not covered above.
Why we like it
Its ECO silent mode keeps the 120mm FDB fan quiet at low load, and Japanese capacitors with LLC and DC-DC topology support long-term stability. Embossed modular cables are easier to route. Its embossed modular cables improve airflow and make routing simpler.
On rated output it ties with the Cooler Master V750 SFX Gold and the be quiet! Pure Power 12 750W at 750W. The SAMA GT750 comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the SAMA GT750, so check the maker's page against your case's PSU bay. It undercut the MONTECH Century II 650W and every other pick on price at the time of writing.
Key specs
- Wattage
- 750W
- Native 12V-2x6 cables
- 1
- Cybenetics rating
- Gold
- ATX version
- ATX 3.1
- Form factor
- ATX
- Cabling
- Fully modular
- Fan
- 120mm
- Fan stop
- Yes
- Colour
- Black
Pros
- A 750W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Fully modular cables
The catch
The maker doesn't give its 8-pin PCIe connector count; if that figure matters, the be quiet! Pure Power 12 750W offers 3.
Best SFX Pick5 of 6
Cooler Master V750 SFX Gold
Cooler Master's V750 SFX Gold has a 90-degree 12V-2x6 cable for tight cases and cable lengths cut for small builds.
Best for
- Small form factor builds.
Skip if
- Skip it if price comes first: the SAMA GT750 cost less when we checked.
Why we like it
Its 90-degree 12VHPWR connector reduces strain on the cable at the graphics card, and the integrated LLC design helps cooling in a small case. It is built for mini-ITX builds. It matches the SAMA GT750 and the be quiet! Pure Power 12 750W on rated output (750W).
The Cooler Master V750 SFX Gold comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the Cooler Master V750 SFX Gold, so check the maker's page against your case's PSU bay. Only the Seasonic CORE GX-650 came close to it on price at the time of writing; it cost the most of the 6 picks. There is no published 8-pin PCIe connector count figure, whereas the be quiet! Pure Power 12 750W offers 3.
Key specs
- Wattage
- 750W
- Native 12V-2x6 cables
- 1
- 80 Plus rating
- Gold
- ATX version
- ATX 3.1
- Form factor
- SFX
- Colour
- Black
Pros
- A 750W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- 90-degree 12V-2x6 cable for tight cases
Cons
- Costs more than the SAMA GT750 at the time of writing
Best 750W be quiet! Pick6 of 6
be quiet! Pure Power 12 750W
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
- Future card upgrades.
Skip if
- Skip it if price comes first: the SAMA GT750 cost less when we checked.
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. On rated output it ties with the SAMA GT750 and the Cooler Master V750 SFX Gold at 750W.
No depth is rated for the be quiet! Pure Power 12 750W, so check the maker's page against your case's PSU bay. Worth noting: ATX 3.1 compliance. Before buying, weigh one limit: costs more than the SAMA GT750 at the time of writing.
Key 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 GT750 at the time of writing
The catch
The trade-off is native 12V-2x6 cable count; for more, the be quiet! Pure Power 12 650W offers 1.
How We Chose
Alex Morgan compared the manufacturer specifications, connectivity, warranty terms and compatibility of every pick. Figures come from the makers unless a third-party source is named; we did not test these products ourselves.
- The figures behind the order
- We set side by side six power supplies on rated output, native 12V-2x6 cable count, 8-pin PCIe connector count and 80 Plus rating from manufacturer specifications. We did not test them in-house, and 8-pin PCIe connector count and 80 Plus rating are missing for at least one pick.
- The shared baseline
- All 6, from the be quiet! Pure Power 12 650W to the be quiet! Pure Power 12 750W, state rated output, native 12V-2x6 cable count and ATX version and share ATX 3.1 ATX version and Black colour.
- Where the specs have gaps
- The MONTECH Century II 650W, the Seasonic CORE GX-650, the SAMA GT750 and the Cooler Master V750 SFX Gold give no 8-pin PCIe connector count; the SAMA GT750 gives no 80 Plus rating.
- Price range
- At our last check the picks ran from the SAMA GT750 ($50 to $100) to the Cooler Master V750 SFX Gold ($100 to $150).
What to Look for in a PSUs for RTX 4070
Key buying criteria so you get the right fit the first time.
Rated output across these picks
The SAMA GT750 tops rated output at 750W and the Seasonic CORE GX-650 sits lowest at 650W; 3 picks share the top figure. The SAMA GT750 is the pick for rated output.
8-pin PCIe connector count
Across these 2 picks 8-pin PCIe connector count spans 2 (the be quiet! Pure Power 12 650W) to 3 (the be quiet! Pure Power 12 750W). If 8-pin PCIe connector count is your first filter, the be quiet! Pure Power 12 750W sets the ceiling at 3. The MONTECH Century II 650W, the Seasonic CORE GX-650, the SAMA GT750 and the Cooler Master V750 SFX Gold give no 8-pin PCIe connector count figure, so 2 of 6 picks are compared here.
A 24-pin ATX connector seen from the pin side Fit and compatibility
The be quiet! Pure Power 12 650W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.
Features beyond the spec table
The SAMA GT750: an ECO silent mode for low load. The Cooler Master V750 SFX Gold: cable lengths cut for small-form-factor builds. The be quiet! Pure Power 12 750W: three PCIe 6+2 connectors plus a native 12V-2x6.
An 8-pin power connector held up to the camera How much to spend
$50 to $100 buys the SAMA GT750, the MONTECH Century II 650W, the be quiet! Pure Power 12 650W, the be quiet! Pure Power 12 750W and the Seasonic CORE GX-650; $100 to $150 buys the Cooler Master V750 SFX Gold at our last check.
How to Choose a PSUs for RTX 4070
By priority
| Priority | Consider | Why |
|---|---|---|
| Most RTX 4070 builds | be quiet! Pure Power 12 650W | 650W with a native 12V-2x6 and a single strong 12V rail |
| Budget builds | MONTECH Century II 650W | A 10-year warranty on a low-cost 650W unit |
| Cards with 8-pin plugs | Seasonic CORE GX-650 | A 12V-2x6 to dual 8-pin cable in the box |
| Headroom on a budget | SAMA GT750 | 750W with Japanese capacitors |
| Small form factor builds | Cooler Master V750 SFX Gold | An SFX unit with a 90-degree 12V-2x6 cable |
| Future card upgrades | be quiet! Pure Power 12 750W | Three PCIe 8-pin connectors plus a 12V-2x6 |
Scroll sideways to see every column.
Key specs side by side
The SAMA GT750 leads on rated output at 750W, ahead of the Cooler Master V750 SFX Gold at 750W. "Not listed" marks 8-pin PCIe connector count where the MONTECH Century II 650W, the Seasonic CORE GX-650, the SAMA GT750 and the Cooler Master V750 SFX Gold leave the figure out.
| Power supplie | Wattage | Native 12V-2x6 cables | PCIe 8-pin connectors | 80 Plus rating |
|---|---|---|---|---|
| be quiet! Pure Power 12 650W | 650W | 1 | 2 | Gold |
| MONTECH Century II 650W | 650W | 1 | Not listed | Gold |
| Seasonic CORE GX-650 | 650W | 1 | Not listed | Gold |
| SAMA GT750 | 750W | 1 | Not listed | Not listed |
| Cooler Master V750 SFX Gold | 750W | 1 | Not listed | Gold |
| be quiet! Pure Power 12 750W | 750W | 1 | 3 | Gold |
Scroll sideways to see every column.
By price at the time of writing
At our last check the cheapest pick, the SAMA GT750, sat in the $50 to $100 tier, 2 tiers in all up to the Cooler Master V750 SFX Gold at $100 to $150; Amazon prices move, so recheck before buying.
| Price tier | Power supplies |
|---|---|
| About $50 to $100 | SAMA GT750, MONTECH Century II 650W, be quiet! Pure Power 12 650W, be quiet! Pure Power 12 750W, Seasonic CORE GX-650 |
| About $100 to $150 | Cooler Master V750 SFX Gold |
Frequently Asked Questions
Is the be quiet! Pure Power 12 750W ahead of the be quiet! Pure Power 12 650W on 8-pin PCIe connector count?
The be quiet! Pure Power 12 750W leads at 3, with the be quiet! Pure Power 12 650W at 2. The MONTECH Century II 650W, the Seasonic CORE GX-650, the SAMA GT750 and the Cooler Master V750 SFX Gold are left out of this ranking because their 8-pin PCIe connector count isn't stated; 2 of 6 picks are ranked.
What makes the be quiet! Pure Power 12 650W the Best Match for an RTX 4070?
It carries the badge for 650W with a native 12V-2x6 and a single strong 12V rail. It gives up rated output (650W against 750W) to the SAMA GT750, the cheapest pick. It makes sense for most RTX 4070 builds.
Which of these power supplies have fan stop?
The MONTECH Century II 650W and the SAMA GT750 have it. The makers of the be quiet! Pure Power 12 650W, the Seasonic CORE GX-650, the Cooler Master V750 SFX Gold and the be quiet! Pure Power 12 750W don't state fan stop, so 2 of 6 picks are covered here.
What should I check before buying the SAMA GT750?
The SAMA GT750 comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the SAMA GT750, so check the maker's page against your case's PSU bay. In this guide it ranks fourth of 6, as our Best Budget 750W pick, and first of 6 on rated output (750W).
Beyond the specs, what sets the be quiet! Pure Power 12 650W and the MONTECH Century II 650W apart?
The be quiet! Pure Power 12 650W: a temperature-controlled 120mm be quiet! fan. The MONTECH Century II 650W: a 10-year warranty at a low price. The Seasonic CORE GX-650: a 12V-2x6 to dual 8-pin cable in the box.
Bottom Line
be quiet!'s Pure Power 12 650W is the best-matched unit for an RTX 4070. Montech's Century II has the longer warranty, Seasonic's GX-650 covers 8-pin cards, and Cooler Master's V750 SFX suits small builds.
Related Guides
- Related guideThe Best 650W Power Supplies for Mid-Range Gaming PCs
- Related guideThe Best SFX Power Supplies for Small Form Factor PCs
- Related guideThe Best RTX 4070 Graphics Cards
- Lower budgetThe Best Power Supplies Under $75
- Similar guideThe Best Power Supplies for the RTX 4070 Ti and Ti Super
- ExplainerHow to choose a power supply for a PC build
- Explainer80 Plus Ratings Explained
- Check compatibility: graphics cardsHow to Choose a Graphics Card for 1440p Gaming
- Similar guideThe Best Power Supplies for the RTX 4070 Super
- Topic hubAll power supplies guides
About the author
PC Hardware Editor
Alex covers PC hardware, monitors, components, upgrades and peripherals for The PC Journal, with a focus on helping readers understand specifications, compatibility and meaningful product trade-offs.
Covers: Monitors, Graphics cards, Processors, PC components, Peripherals, Upgrades and compatibility
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