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Is my 700Watt PSU enough to run OC'd cross fired HD 7850's?

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August 8, 2013 5:13:34 AM

Hi i'm looking at buying a second HD 7850 gpu to run in cross fire but I am unsure whether or not I will have enough head room with my Corsair GS700 PSU. It has a 12V rail with 58A.

I am reasonably confident it will be fine but I was hoping to be able to overclock both GPU's and my FX8320 CPU. Would I have enough head room for decent overclocks?

I am planning to do this all on a 990FX Sabertooth R2.0 motherboard
August 8, 2013 5:25:56 AM

Schython said:
Hi i'm looking at buying a second HD 7850 gpu to run in cross fire but I am unsure whether or not I will have enough head room with my Corsair GS700 PSU. It has a 12V rail with 58A.

I am reasonably confident it will be fine but I was hoping to be able to overclock both GPU's and my FX8320 CPU. Would I have enough head room for decent overclocks?

I am planning to do this all on a 990FX Sabertooth R2.0 motherboard


it is enough , your 7850 consumes only 130 watts ... dont worry
August 8, 2013 5:27:59 AM

here is TOTAL system power (not GPU only)


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August 8, 2013 7:40:03 PM

Thanks. I am keen to get crossfire going and overclock on my new sabertooth motherboard arriving today.
August 8, 2013 8:27:04 PM

Schython said:
Thanks. I am keen to get crossfire going and overclock on my new sabertooth motherboard arriving today.


If you want to overclokc add 100 watts to the power in the total system graph , you will stay under 700 watts .
August 8, 2013 9:26:23 PM

Yes , even a top notch 650w can handle those , with overclocking.
August 8, 2013 11:28:42 PM

Awesome. Thanks guys.
August 8, 2013 11:33:09 PM

750w is a great wattage giving plenty of room for upgrades and not to much room aswell so great choice with that so in short yes you should easily be able crossfire those graphics cards and you may be able to even upgrade further
August 8, 2013 11:41:06 PM

SR-71 Blackbird said:
Yes , even a top notch 650w can handle those , with overclocking.


Awesome. Thanks. I am confident with overclocking my 7850's now.

Will I still have enough headroom to also overclock my FX8320? It has a TDP of 125watts but as I understand it this relates to the heat of the CPU. Sorry I am reasonably new to all of this but I am passionate about it and I am just trying to figure it all out. By the was my PSU is Bronze rated.

!