I have an abit AS8 motherboard with a Pentium 4 2.8 ghz 800 mhz fsb. I bought a vantec gsn-7015 heatsink. I thought this will be fine to cool it but when I went to turn it on the heat alarm went off and shut down. I had enough to time to go to look at the temps and saw it was around 100* C and rising. I put a thin layer of silicon paste but it still overheats. I made sure it wasent a power issue by unplugging the hard drives and cd-rom. So I still dont know what the problem could be.