Devil 13

Should be enough, be cautious of your power supply though. it may or may not be enough. 875 watts should be plenty though. if two 680's can run on 750, hell even two 690's were run on a 850 watt and did fine

Hmm...So u think 875 would do then ?

Hard to say, I tried looking up some specs for that PSU but it looks a bit iffy imo... Pretty sure it doesn't have any 80+ cert either so the quality could swing any way really.

EDIT: Appears they are used in Alienware desktops so they should be fine, but I still couldn't give you a conclusive answer tbh.

Yeah, maybe i should just call Alienware and ask since it is an Alienware i have.

If the power supply is used in alienware desktops, then expect a quality degrade down to about 750 watts over time. Since a power supply is being used and when under load it tends to "ware down" over time loosing effieciency. The higher the quality, the longer it lasts. Makes sense right? so for one devil 13 that has two 7970's on board, i'd say a nice modular 800 watt would be just enough. 750 might be pushing it with a 980 which is a 6 core cpu

I just checked and regarding to this picture it has 80+. https://splusdirect.com/include/plugins/plugin_rollover... . But then i saw that my PSU and the one at the picture havent got the same DP/N number...

argh... bad resolution. This link works instead. http://splusdirect.com/index.php?l=product_detail&p=383...