GTX 660 2gb OC windforce - System shutdown during gaming

[james5118]

Hello,

I just received and installed my GIGABYTE Gtx 660 oc 2gb windforce card (brand new) today and when I go to play games like BF3, WoW, D3 my entire computer will just shutdown after like 2-5 mins of game play (smooth game play no problems). No errors or anything it just simply shuts down. Card is not overheating its at around 27-30C idle and 45-55C under load for the games i've been playing. I can browse the internet and watch videos and no shutdown happens. I have not had any problems like this with my previous card a HD radeon 5770 1gb.

I have installed the latest drivers as of today (31/12/2012) right after installation.

My setup:

OS: Windows 7 ultimate 64 bit
GPU: Gigabyte GTX 660 2gb DDR5 OC windforce
CPU: AMD Phenom II X6 1055T processor 6 cores ~2.8Ghz
Memory: 8 GB of hyperx 1600mhz ram
PSU: 700watt Xion supply
MB: ASUSTek Computer INC, Model: M4N68T-M-V2, chipset: NVIDIA GeForce 7025
Bios: American Megatrends Inc, Version: 0501, Date: 08/03/2010

I am not sure what would be causing this problem, is it just a faulty card or? I connected the GPU connector to 2 separate 12v rails both which are 21A.
If you could please help it would be appreciated!

Thanks.

[Sigtran]

Could be (at least) two things...

1) Card VRM (not GPU, but VRM - voltage regulator) is overheating, and card is shutting itself off. Try your card in some other computer, as if it is a VRM, same thing will happen.
or
2) your PSU is overheating and shutting itself off. This is less likely, but possible. 5770 is using 50-60W W less, so maybe this 50-60W more is problematic. It should not be as your PSU should be 700W, but it could be defective?

[Chromoblaste]

I would simply say that it is a supply problem! In my opinion it is defective! I m ^ me the problem with a Corsair 850w! Once the card was pumping too much power cycled the PC!

[james5118]

So i picked up another gtx 660 and problem seems to be fine now so i guess it was a faulty card