I have a question regarding core temperatures. I have core load and core temperatures constantly displayed on my second screen so I know what's going on, especially when I play hardware demanding games. The fan-based cooling of my midi tower is not perfect but it's always worked out. I have a fan in the PSU at the bottom, a big fan at the top and another big one cooling the CPU with the heatsink. Not sure about the CPU fan but the other two blow hot air out of the tower. So in the past months my idle CPU temperatures were in the 65Â°C range. Idle as in, browser, winamp, chatting and the Windows stuff like moving and copying files. 3.5GB of 8GB in use. Keep in mind we have quite warm months right now. GPU at around 50Â°C; it has to support 2 screens all the time. Recently the CPU temperature has been going very high while playing games. I just finished Portal 1 for the first time in my life and the 1st core was running around 99Â°C most of the time. Since not many games are optimized for multiple cores, the first two cores always have to do most of the work and are therefore often higher in temperature than the other two I have. As a reminder, I'm running an Intel Q9550 Core2 Quad CPU. The temperatures can't be around 100Â°C all the time though because I can't smell anything and the PC is not shutting itself off because the CPU gets too hot, either. That feature is enabled, I know that for a fact. I also know that modern chips sort of reduce their performance if they start to run hot in order to prevent damage. I've been playing for a while and haven't noticed anything. GPU never exceeds 75Â°C due to its 2 fans. I'm just throwing facts at you, sorry for the disorganized post. For about half a year, I'm also getting an odd BIOS message every time I start the PC when it wasn't previously used (reboot, short break, etc.). It says it's detected a CPU Fan Error and I have to press F1 to continue. When I first got that message, I opened the tower and started the PC. The CPU fan was working so after some googling, I thought it's some sort of sensor error I can't be bothered to attempt to fix. Had no problems with the PC, even with that message. Any ideas or comments on the temperatures? Will I be fine until it decides to shut down for the first time? The only thing I can and probably will do in the next couple of days is clean the inside and remove as much dust as possible. I will not remove the heatsink because it has some ugly black pins that will definitely break if I try to get it all off the motherboard in order to put it all back together afterwards.