The other day I got an Athlon XP 1800+ to replace my 1.4 (for a little more speed and less heat). Well, I popped out the old one and put some grease on the XP, and slapped my Vantec copper heatsink on it (topped off with a Delta black label) and put everything back together. I turned it on once just to make sure it booted, and hadn't used it as I was away all weekend. Well last night I was working on my new P4 system and I powered up the Athlon one to install Windows, etc. After a couple of hours, I happened to touch the top of my case (it's aluminum) and it was REALLY hot! I thought that wasn't good, so I went into the BIOS to check readings, and the cpu was at 64.5 degrees!!! I couldn't believe it, as I thought the XPs were supposed to run cooler. Then I realized that when I took off my HSF I must have unplugged the fan, and never plugged it back in. As a matter of fact, I remember thinking to myself last night "wow, this system seems a lot quieter than it used to". So obviously the Delta wasn't even on. So I guess this is a lesson to not do that again. Fortunately, the processor is fine, even though it was at 64 degrees for a couple of hours. I am actually impressed that it didn't go higher, since there was only a heatsink working for it. D'oh!!!