Asus GTX 650ti OC problem

My card doesn't seem to like windows experience index, I can run FurMark with my GPU OC'd at 1130Mhz with 5600Mhz vRAM and max voltage but once I try the Windows Experience Index the drivers keep crashing once it hits Direct 3d 10 ALU assessment. Even a slight OC does that, like going from stock clock to 1000Mhz GPU.

My specs are:
AMD FX 6300
MSI 990xa-GD55
Cooler Master GX750w PSU
8gb Corsair Ram

Does it run fine in games and Heaven benchmark?

Haven't tried heaven yet. It did my first over clock then I rebooted my PC and it crashes every time unless I'm running stock

Ive got it solved. I was playing around in gpu-z and it showed that I was running in x8 mode. Must have moved the card into an x8 slot on my mobo. Moved it to the x16 and no more problems