Why does my desktop shutdown when I use dual Radeon HD 7870GHz video cards

rexster · Dec 16, 2013

I am trying to use my desktop for litecoin mining and every time I utilize both video cards at 99% activity after about 5-12 min my computer just shutdowns. The clock settings were at stock. Other times my monitor will flicker a couple time really quick but then just go grey with lines. If anyone could help out, I'd really appreciate! Do you guys think it's the power supply?

Desktop Specs:

Intel Core 2 Quad Q6600 2.40GHz
EVGA nforce 780i SLI motherboard
DDR2 800MHZ 4GB Total
Windows 7
Sapphire Radeon HD 7870 GHz Edition (x2)
650W Power Supply (I think cooler master brand)

Boss Cat Johnson · Dec 16, 2013

Its probably because you don't have a strong enough power supply. Here ya go.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair CX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ Microcenter)
Total: $59.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-16 23:29 EST-0500)

Anub1s · Dec 16, 2013

What are your temps looking like? 650W should be enough for that setup, actually. I don't suspect the PSU at all. Sounds more like an overheating issue.

rexster · Dec 17, 2013

Boss Cat Johnson :

Anub1s :

Catalyst shows about a constant 64C, so if not the PSU then would it just be the nvidia mother board?

Anub1s · Dec 17, 2013

Kind of skimmed over that motherboard you mentioned. It does not support Crossfire, only SLI, so there's your problem.

rexster · Dec 17, 2013

Anub1s :

Thanks for the feedback! But I''m not using SLI or Crossfire, I mentioned earlier they are used for mining litecoins. But I'm going to try out upgrading the PSU to 750 watts like the other guy mentioned. If you are anyone else has other solutions feel free to post away!

Thank you!

Anub1s · Dec 17, 2013

Unfortunately *coin mining is something I'm not familiar with, so I will have to defer to someone with more experience there. Good luck to you! Sorry I couldn't be of more help.

huilun02 · Dec 17, 2013

You are doing LiteCoin mining, that's the problem.

rexster · Dec 17, 2013

huilun02 :

Thanks for the feedback, but your answer does not make sense.

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Why does my desktop shutdown when I use dual Radeon HD 7870GHz video cards

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