Hello, I've been having a recent issue with my year old, custom build gaming pc that involves strange cpu overheating. Only recently, my cpu has started to hit around 60-65 degrees C. The kicker is that if i simply alt tab out of the game, it goes straight back down to 40 C, like if it were idling. Is it usual for the cpu to get hot only if the game is actually running, but not if it is alt tabbed out yet still on. Also, only my cpu is overheating, my gpu is fine. Don't know if this will help but this also doesn't happen for games that actually overheat my pc, specificly Far Cry 3. It gets that hot even if i'm alt tabbed out, so I will be getting a new heatsink soon. Any suggestions about what the problem may be, I would love to keep playing games. My specs are windows 7, 64 bit, an intel core i5 2400 @ 3.10GHz cpu, 8 GB of ram, a biostar group TZ68K+ mobo, GeForce 9800 GTX+ gpu, 699 GB Hitachi HDS721075DLE630 hard drive. Would getting a new heatsink fix this particular problem, or is it something else entirly. Also, I recently reapplied fresh thermal paste, configured my speedfan to optimize my fan settings, and cleaned out my entire rig. Any help would be appreciated.