I have problems with BF3 indeed. The GPU usage in this game drops more frequently than the others. I also faced problems especially with Crysis 1, in Crysis 2 the problem isn't very noticable and occurs rarely, but probably I didn't notice it as Crysis 2 is light on 1280x1024 and Hardcore graphics only.
When opening the PC, I noticed that the card had 6 PIn cable and 6+2 pin cable. However, he connected in a weird way. He connected the 6 pin part of the 6+2 pin cable into the 6 pin part, then he plugged into the 6 pin cable to the 8 pin part then converted the 2 pin part of one cable to the 2 pin part of the card with the other cable.
So let's say cable 1 is 6pin and cable 2 is 6+2, port A on the card is 6 pin and port B is 8 pin.
It's connected like this :
Cable 1 + 2 pin part of cable 2 -----> Port B
6 pin part of Cable 2 -----> Port A.
Should this cause any problems?
Also, the RAM he installed is 1.65v and my mobo supports up to 1.5v, so it ran at 1333 MHz ( its stock is 1600 ) until we manually set the multiplier in memory config in the bios to 16.00. However, the timing changed to 9-11-11-29 from 9-9-9-24. Should I return it and get a 1.5V?