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

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)
8 answers Last reply Best Answer
More about desktop shutdown dual radeon 7870ghz video cards
  1. 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)
  2. 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.
  3. Boss Cat Johnson said:
    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 said:
    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.


    Catalyst shows about a constant 64C, so if not the PSU then would it just be the nvidia mother board?
  4. Best answer
    Kind of skimmed over that motherboard you mentioned. It does not support Crossfire, only SLI, so there's your problem.
  5. Anub1s said:
    Kind of skimmed over that motherboard you mentioned. It does not support Crossfire, only SLI, so there's your problem.


    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!
  6. 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.
  7. You are doing LiteCoin mining, that's the problem.
  8. huilun02 said:
    You are doing LiteCoin mining, that's the problem.


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