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 The PC Journal editorial team
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
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Best Match for an RTX 4070
be quiet! Pure Power 12 650W
650W with a native 12V-2x6 and a single strong 12V rail.
Best for: Most RTX 4070 builds.
Our take Check price for be quiet! Pure Power 12 650W (opens in a new tab)
Best Warranty Value
MONTECH Century II 650W
A 10-year warranty on a low-cost 650W unit.
Best for: Budget builds.
Our take Check price for MONTECH Century II 650W (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.
Our take Check price for Seasonic CORE GX-650 (ATX 3.1) (opens in a new tab)
Best Budget 750W
SAMA GT750
750W with Japanese capacitors.
Best for: Headroom on a budget.
Best SFX Pick
Cooler Master V750 SFX Gold
An SFX unit with a 90-degree 12V-2x6 cable.
Best for: Small form factor builds.
Our take Check price for Cooler Master V750 SFX Gold (opens in a new tab)
Best 750W be quiet! Pick
be quiet! Pure Power 12 750W
Three PCIe 8-pin connectors plus a 12V-2x6.
Best for: Future card upgrades.
Our take Check price for be quiet! Pure Power 12 750W (opens in a new tab)
Our Picks
Best Match for an RTX 40701 of 6
be quiet! Pure Power 12 650W on Amazon (opens in a new tab)
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. Worth noting too: 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 dimensions & 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 on Amazon (opens in a new tab)
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 dimensions & 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) on Amazon (opens in a new tab)
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 is 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 dimensions & 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 on Amazon (opens in a new tab)
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. The maker doesn't give its 8-pin PCIe connector count; if that figure matters, the be quiet! Pure Power 12 750W offers 3.
Key dimensions & 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
Best SFX Pick5 of 6
Cooler Master V750 SFX Gold on Amazon (opens in a new tab)
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 dimensions & 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 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
- 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. It also brings ATX 3.1 compliance. The trade-off is native 12V-2x6 cable count; for more, the be quiet! Pure Power 12 650W offers 1.
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 GT750 at the time of writing
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- Connectors
- We recorded native 12V-2x6 cables and PCIe 8-pin connectors where the listing states them.
- Standards
- We noted ATX version, 80 Plus and Cybenetics ratings.
- 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.
What to Look for in a PSUs for RTX 4070
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.
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.
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.
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.
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.
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
Figures as each maker states them.
| 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
Prices change often; these tiers reflect Amazon prices when this guide was updated.
| 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
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.
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.
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 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.
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.
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.