I recently purchased a second 4GB EVGA GTX 770 but because I got it at a different period of time from when I got my first one they were manufactured differently (EVGA changed the way the particular card was made). It seems like the two graphics cards have different PCBs and I was wondering if that could cause compatibility issues because ever since I linked the two in SLI I have had repeated video driver crashes. One of my friends have told me that it could be an issue with heating however the cards are both being liquid cooled. Pls halp :c