Buying Guide

The Best Power Supplies for the RTX 5070

Six 650W and 750W units with native 12V-2x6 cables, matched to NVIDIA's 650W recommendation for the RTX 5070.

By , PC Hardware Editor

12 min read6 products evaluated

PC components laid out on a workbench ready for a build
Illustrative image

NVIDIA recommends a 650W power supply for the RTX 5070, which uses a 16-pin 12V-2x6 connector. Each unit here offers a native 12V-2x6 cable.

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.

  1. Best Match for an RTX 5070

    MONTECH Century II 650W

    650W with a native 12V-2x6 and a 10-year warranty.

    Best for: Most RTX 5070 builds.

    Check price for MONTECH Century II 650W on Amazon (opens in a new tab)
  2. Best Cable Kit

    Seasonic CORE GX-650 (ATX 3.1)

    A native 12V-2x6 plus a 12V-2x6 to dual 8-pin cable.

    Best for: Swapping between card types.

    Check price for Seasonic CORE GX-650 (ATX 3.1) on Amazon (opens in a new tab)
  3. Best be quiet! Pick

    be quiet! Pure Power 12 650W

    Two PCIe 8-pin connectors plus a 12V-2x6.

    Best for: Quiet builds.

    Check price for be quiet! Pure Power 12 650W on Amazon (opens in a new tab)
  4. Best White Pick

    SAMA GT650 White

    A white fully modular 650W unit.

    Best for: White builds.

    Check price for SAMA GT650 White on Amazon (opens in a new tab)
  5. Best 750W Headroom

    ASRock Phantom Gaming PG-750G

    750W with a 10-year warranty.

    Best for: Future upgrades.

    Check price for ASRock Phantom Gaming PG-750G on Amazon (opens in a new tab)
  6. Best Compact 750W

    darkFlash DG750

    750W in a 140mm body.

    Best for: Short PSU bays.

    Check price for darkFlash DG750 on Amazon (opens in a new tab)

Our Picks

Best Match for an RTX 50701 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

Most RTX 5070 builds.

Skip if

Skip it if price comes first: the darkFlash DG750 cost less when we checked.
MONTECH Century II 650W

Why we like it

Its 135mm FDB fan has a zero RPM mode, and it uses 100% Japanese capacitors. On rated output it ties with the Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White at 650W. It matches the ASRock Phantom Gaming PG-750G on warranty (10 years).

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. On price it sat third of 6, between the cheaper SAMA GT650 White and the pricier ASRock Phantom Gaming PG-750G, at the time of writing.

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 darkFlash DG750 at the time of writing

The catch

The maker doesn't give its depth; if that figure matters, the darkFlash DG750 comes in at 140mm.

Best Cable Kit2 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

Swapping between card types.

Skip if

Skip it if you need to know its warranty before buying; the maker doesn't publish one.
Seasonic CORE GX-650 (ATX 3.1)

Why we like it

It is 80 Plus Gold and listed as ready for the RTX 5060 Ti and RX 9000 cards. It matches the MONTECH Century II 650W, the be quiet! Pure Power 12 650W and the SAMA GT650 White on rated output (650W). No depth is rated for the Seasonic CORE GX-650, so check the maker's page against your case's PSU bay.

At our last price check it topped the group, with the be quiet! Pure Power 12 650W the nearest cheaper option. If you want a confirmed warranty, look to the MONTECH Century II 650W instead: it offers 10 years, while this one gives no figure.

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

  • No published warranty
  • Costs more than the darkFlash DG750 at the time of writing

Best be quiet! Pick3 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

Quiet builds.

Skip if

Its warranty is not published, which rules it out if you need that number.
be quiet! Pure Power 12 650W

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.

On rated output it ties with the MONTECH Century II 650W, the Seasonic CORE GX-650 and the SAMA GT650 White at 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. On price it sat fifth of 6, between the cheaper ASRock Phantom Gaming PG-750G and the pricier Seasonic CORE GX-650, 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

  • No published warranty
  • Costs more than the darkFlash DG750 at the time of writing

The catch

The maker doesn't give its warranty; if that figure matters, the MONTECH Century II 650W offers 10 years.

Best White Pick4 of 6

SAMA GT650 White

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 Phantom Gaming PG-750G offers 750W.
SAMA GT650 White

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 ties with the MONTECH Century II 650W, the Seasonic CORE GX-650 and the be quiet! Pure Power 12 650W at 650W.

A white colour is unique to it among these picks, while the MONTECH Century II 650W 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. Its price falls between the darkFlash DG750 and the MONTECH Century II 650W, based on our last check.

Key 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 Phantom Gaming PG-750G (750W)
  • No published warranty
  • Costs more than the darkFlash DG750 at the time of writing

The catch

If rated output is your priority, the ASRock Phantom Gaming PG-750G (750W) is the stronger choice.

Best 750W Headroom5 of 6

ASRock Phantom Gaming PG-750G

ASRock's Phantom Gaming PG-750G has a 90-degree 12V-2x6 cable with a temperature sensor, braided cables and a 10-year warranty.

Best for

Future upgrades.

Skip if

If budget leads, the darkFlash DG750 was cheaper at our last price check.
ASRock Phantom Gaming PG-750G

Why we like it

It is 150mm deep and rated Cybenetics Platinum. It is fully modular with braided cables and a 90-degree PCIe 5.1 connector that has a temperature sensor. ASRock rates its efficiency 2% above the Gold standard.

The 12V-2x6 cable is dual-color and rated to 105 degrees C, and ASRock lists iCOOL intelligent fan control and 220% total power excursion. It measures 5.91 x 5.91 x 3.39 inches, and ASRock notes it is not compatible with all prebuilt systems. On rated output it ties with the darkFlash DG750 at 750W.

It matches the MONTECH Century II 650W on warranty (10 years). The ASRock Phantom Gaming PG-750G comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. At 150mm deep, compare it with your case's PSU clearance before buying. Its price falls between the MONTECH Century II 650W and the be quiet! Pure Power 12 650W, based on our last check.

Key specs

Wattage
750W
Native 12V-2x6 cables
1
Warranty
10 years
Depth
150mm
80 Plus rating
Gold
Cybenetics rating
Platinum
ATX version
ATX 3.1
Form factor
ATX
Cabling
Fully modular
Colour
Black

Pros

  • A 750W rating
  • A native 12V-2x6 cable for 16-pin cards
  • A 10-year warranty
  • ATX 3.1 compliance

Cons

  • Costs more than the darkFlash DG750 at the time of writing

Best Compact 750W6 of 6

darkFlash DG750

darkFlash's DG750 is a 140mm-deep 80 Plus Gold unit with a native 12V-2x6 cable and a hydraulic-bearing fan.

Best for

Short PSU bays.

Skip if

Choose another pick if you can't accept this: a shorter 5-year warranty.
darkFlash DG750

Why we like it

Its warranty is 5 years. It is fully modular with a quiet HDB fan, 80 Plus Gold rated, and backed by a 5-year limited warranty. Its fully modular cables reduce clutter for first-time builders.

It matches the ASRock Phantom Gaming PG-750G on rated output (750W). On warranty it trails the group at 5 years, while the MONTECH Century II 650W offers 10 years. You also get a 140mm body that leaves room for cables.

The darkFlash DG750 comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. At 140mm deep, compare it with your case's PSU clearance before buying. It cost the least of the 6 picks at the time of writing, with the SAMA GT650 White the next step up.

Key specs

Wattage
750W
Native 12V-2x6 cables
1
Warranty
5 years
Depth
140mm
80 Plus rating
Gold
ATX version
ATX 3.1
Form factor
ATX
Cabling
Fully modular
Colour
Black

Pros

  • A 750W rating
  • A native 12V-2x6 cable for 16-pin cards
  • A short 140mm body
  • ATX 3.1 compliance

Cons

  • A shorter 5-year warranty
  • Warranty trails the MONTECH Century II 650W (10 years)

The catch

It gives ground on native 12V-2x6 cable count, where the MONTECH Century II 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.

A 24-pin ATX connector seen from the pin side
A 24-pin ATX connector seen from the pin side
What we compared
We lined up six power supplies on rated output, native 12V-2x6 cable count, warranty and depth as the makers state them. These are research figures, not bench results: 3 of 6 picks leave out warranty.
What every pick has in common
All 6, from the MONTECH Century II 650W to the darkFlash DG750, state rated output, native 12V-2x6 cable count and ATX version and share ATX 3.1 ATX version.
Where the specs have gaps
The Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White give no warranty; the MONTECH Century II 650W, the Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White give no depth.
Price range
From the darkFlash DG750 to the Seasonic CORE GX-650, all sat in the $50 to $100 tier when we checked.

What to Look for in a PSUs for RTX 5070

Key buying criteria so you get the right fit the first time.

  1. Rated output across these picks

    Here rated output runs from 650W on the SAMA GT650 White to 750W on the ASRock Phantom Gaming PG-750G, a 15% spread. The darkFlash DG750 comes second at 750W, in the same price tier as the ASRock Phantom Gaming PG-750G.

  2. How much warranty you need

    Across these 3 picks warranty spans 5 years (the darkFlash DG750) to 10 years (the MONTECH Century II 650W). The MONTECH Century II 650W is the pick for warranty. The Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White give no warranty figure, so 3 of 6 picks are compared here.

    An 8-pin power connector held up to the camera
    An 8-pin power connector held up to the camera
  3. How much depth you need

    The darkFlash DG750 tops depth at 140mm and the ASRock Phantom Gaming PG-750G sits lowest at 150mm. The darkFlash DG750 is the pick for depth. The MONTECH Century II 650W, the Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White give no depth figure, so 2 of 6 picks are compared here.

  4. What to check at home

    The MONTECH Century II 650W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.

    Modular cable sockets on the back of a power supply
    Modular cable sockets on the back of a power supply
  5. Extras that separate them

    The SAMA GT650 White: embossed white cables. The ASRock Phantom Gaming PG-750G: individually braided cables. The darkFlash DG750: a hydraulic-bearing fan.

How to Choose a PSUs for RTX 5070

By priority

PriorityConsiderWhy
Most RTX 5070 buildsMONTECH Century II 650W650W with a native 12V-2x6 and a 10-year warranty
Swapping between card typesSeasonic CORE GX-650A native 12V-2x6 plus a 12V-2x6 to dual 8-pin cable
Quiet buildsbe quiet! Pure Power 12 650WTwo PCIe 8-pin connectors plus a 12V-2x6
White buildsSAMA GT650 WhiteA white fully modular 650W unit
Future upgradesASRock Phantom Gaming PG-750G750W with a 10-year warranty
Short PSU baysdarkFlash DG750750W in a 140mm body

Scroll sideways to see every column.

Power cables routed to a graphics card inside a PC
Power cables routed to a graphics card inside a PC

Key specs side by side

The ASRock Phantom Gaming PG-750G leads on rated output at 750W, ahead of the darkFlash DG750 at 750W. "Not listed" marks warranty where the Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White leave the figure out.

Power supplieWattageNative 12V-2x6 cablesWarrantyDepth
MONTECH Century II 650W650W110 yearsNot listed
Seasonic CORE GX-650650W1Not listedNot listed
be quiet! Pure Power 12 650W650W1Not listedNot listed
SAMA GT650 White650W1Not listedNot listed
ASRock Phantom Gaming PG-750G750W110 years150mm
darkFlash DG750750W15 years140mm

Scroll sideways to see every column.

Frequently Asked Questions

A 24-pin ATX power cable held in a hand
A 24-pin ATX power cable held in a hand

How does the ASRock Phantom Gaming PG-750G compare with the darkFlash DG750 on depth?

The darkFlash DG750 comes out best at 140mm, with the ASRock Phantom Gaming PG-750G at 150mm. The MONTECH Century II 650W, the Seasonic CORE GX-650, the be quiet! Pure Power 12 650W and the SAMA GT650 White don't state a depth figure, so they sit outside this comparison; 2 of 6 picks are ranked.

What does the Seasonic CORE GX-650 add over the darkFlash DG750?

The Seasonic CORE GX-650 matches or trails the darkFlash DG750 on rated output. The darkFlash DG750 leads on rated output (750W). Both sat in the $50 to $100 tier when we checked, so choose on the features you need.

Why is the Seasonic CORE GX-650 our Best Cable Kit pick?

It earns the label for a native 12V-2x6 plus a 12V-2x6 to dual 8-pin cable. The price of that: the darkFlash DG750, the cheapest pick, still beats it on rated output (750W against 650W). It is aimed at swapping between card types.

Does the MONTECH Century II 650W have fan stop, and which others do?

The MONTECH Century II 650W and the SAMA GT650 White have it. The Seasonic CORE GX-650, the be quiet! Pure Power 12 650W, the ASRock Phantom Gaming PG-750G and the darkFlash DG750 have no fan stop listed, so 2 of 6 picks are covered here.

Will the MONTECH Century II 650W work with my setup?

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. In this guide it ranks first of 6, as our Best Match for an RTX 5070 pick, and third of 6 on rated output (650W).

What extras do the MONTECH Century II 650W and the Seasonic CORE GX-650 include?

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. The be quiet! Pure Power 12 650W: a temperature-controlled 120mm be quiet! fan.

Bottom Line

Montech's Century II 650W is the best-matched unit for an RTX 5070, with a 10-year warranty. Seasonic's GX-650 has the most flexible cable kit, and ASRock's PG-750G adds headroom.

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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