ATX 3.0 PSU with AMD GPU?

Posted by tasaiv@reddit | buildapc | View on Reddit | 16 comments

Hi, so I have made a mistake of buying ATX 3.0 PSU with AMD Graphics Card and I was not prepared with connecting issues.

I have bought Thermaltake Toughpower GF3 1000W and tried to pair it with RX 7900 XT Asus TUF GAMING. Unfortunately I did not do my research well as this PSU has 12VHPWR cable and GPU only inputs 3x8 pin PCIE cables. Do you have any suggestions or ideas what can I do in this situation? I am thinking about returning the graphics card and maybe buying Nvidia one that has 12VHPWR input natively.

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n7_trekkie@reddit

use the 2 pcie cables included with your PSU, it's fine

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tasaiv@reddit (OP)

So I've got only one PCIE slot on the PSU and one cable that ends with 2x8pin but the card itself has 3x8pin input

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n7_trekkie@reddit

Thermaltake Toughpower GF3 1000W

https://thermaltakeusa.com/cdn/shop/files/toughpower_gf3_1000_01.jpg?v=1691177884&width=713

you have 4 labelled cpu&pcie

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tasaiv@reddit (OP)

Yes and 3 of already in use: 2 for CPU and 1 for PCIE power in mobo

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n7_trekkie@reddit

your mobo doesnt need pcie power. you may leave it unplugged

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tasaiv@reddit (OP)

Okay thank you, very helpful tip. So this leaves me with two PCIE slots to spare on the PSU part. But then I've got 3x8pin on my GPU as an input. Wouldn't it be a problem if I'd connect one directly with 1x8pin and then the other two slots with 2x8pin coming from the same slot?

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n7_trekkie@reddit

no, that is not an issue

https://d33v4339jhl8k0.cloudfront.net/docs/assets/5bb76d0e042863158cc71a8e/images/62f0bba280fd5a31e7acfed5/file-Y9A95zStok.png (from seasonic)

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raxiel_@reddit

What's the original source of that image?

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n7_trekkie@reddit

Seasonic, the labels on the psus say seasonic

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tasaiv@reddit (OP)

Well unfortunately the PCIE cables seem to be too short. I managed to insert two of them with daisy chains yet for the third slot it felt short so I guess I have to return this GPU nonetheless :(

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tasaiv@reddit (OP)

Oh my god so that resolves my issue then. Thank you so much!

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tasaiv@reddit (OP)

Well unfortunately the PCIE cables seem to be too short. I managed to insert two of them with daisy chains yet for the third slot it felt short so I guess I have to return this GPU nonetheless :(

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tasaiv@reddit (OP)

Could you clarify that? I've got one PCIE slot left and a cable that goes PCIE to 2x8 pin yet the GPU input is 3x8pin