PSU requirement for 2x MSI r9 280x GPUs

spiphix · Jan 16, 2014

Hey all, so I have 2 r9 280x's that I plan to mine Litecoins with. I current have a Seasonic 750w PSU (I believe it's this model: http://www.newegg.ca/Product/Product.aspx?Item=N82E16817151087)

Maxed out I believe that the cards each use 250w? I have no plans to OC them. My question is would this PSU be able to handle both cards maxed out?

The rest of the system is:
i5-760
8GB G.Skill RAM
In a HAF X case with every fan slot filled (if their power matters?)

I have an extra 620W PSU that I could power one of the cards with if needed.

Let me know what you guys think, thanks for any help!

ProWilma · Jan 16, 2014

A quality 80+ 750W power supply.

jeremyp79 · Jan 16, 2014

Yes, your power supply should be able to handle them both, but I wouldnt be overclocking anything.

whitecat · Jan 16, 2014

R9 280X draws up to 250W and needs one 6 and one 8 pin power connector
2x250W =500 W
900W is the recommended for R9 280X and two 6 pin and two 8 pin power connectors
So , the 750W psu is not enough.

aevm · Jan 16, 2014

AMD recommends 30A minimum for a system with one R9-280x. The second card would need at most 300W under load, so another 25A.
That's a total of 55A. Your Seasonic 750W delivers up to 62A. It should work.

aevm · Jan 16, 2014

On second thought, the 30A recommendation for a system with a card that takes 25A by itself is insane... Yeah, use the second PSU for the second card, it's much safer.

whitecat · Jan 16, 2014

aevm :

Leave some power for the cpu , the motherboard ,RAM ,...

jeremyp79 · Jan 16, 2014

http://extreme.outervision.com/PSUEngine shows a total system usage of 694 watts, with 10 140mm fans, 3 hdds(7200rpm) and a single dvd rw. Again, your 750 watt power supply should be enough, but I wouldn't overclock anything.

aevm · Jan 16, 2014

whitecat :

Exactly. I don't know why they said 30A, that can't possibly work when the card is fully loaded. It leaves only 5A, not even enough for the CPU.

redeemer · Jan 16, 2014

I would honestly grab a quality 850w PSU like Corsair HX850w

spiphix · Jan 16, 2014

Thanks for all the help guys! I also didn't mention there are 2 Mushkin Chronos SSDs in the system. I've seen some mixed reviews so I'm thinking I may opt for using both PSUs.

One other question I have is if I tested using both cards on the 750W PSU, are there any dangers of doing so and briefly under-powering the cards? Is this a risk I shouldn't take?

whitecat · Jan 16, 2014

spiphix :

your cpu is 95W , mobo maybe -75W =170W +500W=670W . add memory .....

ko888 · Jan 16, 2014

Bitmining uses 50 Watts more per R9 280X card. You should be using both PSUs if you're going to be mining for any length of time. A lot of heat will be given off by the GPUs s make sure your case has good ventilation.

spiphix · Jan 19, 2014

So I bought a power monitor that my pc is now plugged into. Looks like whilst mining it's using around 660-670Watts. Thanks for the help guys!

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