I noticed a fan running louder than usual lately (2 weeks ago) when I play Skyrim (it is the only PC game I've been playing since the beginning of this year). I thought it might be the GPU fan, so I installed HWMonitor to look at GPU temperatures. Turns out the GPU temperatures are fine, but I'm finding that the CPU temperatures are kind of high. My processor is a Phenom II X4 955 Black Edition. It is not overclocked. It is a quad core CPU operating at 3.2 GHz. Someone on another forum said this to me: "Max operating temp on the Phenom II X4 955 Black Edition is 55°C - 62°C". Is this true? I played Skyrim last night while HWMonitor was running, and the max temp recorded for all 4 cores of my CPU was 67 degrees Celsius. The fan that is running louder must be the CPU fan, and you can tell it is working harder. It works harder than it used to when I played Skyrim in the past; before recently. Is my CPU operating at a dangerous temperature? What can I do to remedy this problem? I think the first step is to clean my computer. It is long over due for being cleaned of dust. In the next few days, I want to clean the inside of my PC. I found a guide on how to clean the inside of a PC on another forum. Do you suppose this is the likely cause of the overheating and louder fan? I'd like to know, would it still be safe for me to play that PC game for the next few days? I was thinking of cleaning the inside of my PC this weekend. I'll run HWMonitor whenever I play it and keep an eye on the temperature of the CPU. Is there a certain temperature I have to look out for, one that would make me have to stop playing the game until I fix the issue? After I clean out the inside of my PC, if this doesn't fix my problem, I'll report back here. What else may be the source of my problem? One more thing, I just found this forum after googling about safe CPU temperatures. Is this forum a really good place for help and info on computer issues?