I recently replaced my GeForce 420 GT with 630 GT and I noticed when play games like BF3 the case fan will rev really high for about 30 seconds and then go down for a few minutes before repeating the high revving. I've minimized while in-game and checked my CPU and GPU temps and GPU is between 40 and 60 C while the CPU is between 30 and 50 C. Do I need to adjust the fan settings somewhere or am I running too hot?