Hi guys, I've bought HIS R7 260X IceQ X2 1GB for a week and I'm suffering a really annoying problem. When I played some games (like AC4,FC3,..), the fps was very low, although I had choosed medium settings ( AA off at res 1366x768). I was so disappointed when my card should play those games smoothly at even much higher settings. Then I discovered that my GPU Core Clock stuck at 2D Clock 300Mhz and it never changed. I tried so many ways to fix the problem (reinstalling the Windows, reinstalling many versions of AMD Drivers) but it didnt come to the solution. Can you guys help me to solve this? Thank you very much!