GTX 660 SLI Causing Computer Shutdown

AlignedName52

Reputable
Oct 1, 2014
2
0
4,510
Hi all,
I had a single gtx 660 and it ran games like skyrim and tomb raider at 1080p on ultra just fine, but I threw in another 660 for sli and the computer shuts down within a minute of launching the game. Can someone please help solve this issue. If you need to know my PC specs, just let me know.
 

AlignedName52

Reputable
Oct 1, 2014
2
0
4,510
I7 3770k
Z77X UD3H mobo
8 gb hyperX red
Corsair H100i LC system
CX750M Corsair PSU

Idle temps for these cards are around 33C. When gaming on ultra settings at 1080p with a single card, I get around 65 to 70 C.