Hi, I installed a 3400 arctic cooling HSF on my 2600(not the best but it should do the job) and I bought some arctic silver 5 paste just to make sure it kept it nice and cool. When I fist put it all on MBM5 was registering it about 43 degrees idle and about 50 degrees under load. BUt recently it the temperatures have been rising to about 60 degrees under load and bout 52 idle. I know it can't be the HSF because I had it running at the the first temps i said for about 1 month and all of a sudden the temperatures have risen sharply. I have tried the stock cooler in the paste with the stock paste and even that was better than what I'm registering now. Is there a chance the Motherboard is at fault? I would rather replace the motherboard than have my motherboard and CPU crap out in a couple of months if my temps keep rising. Thanks for any help,John.