compatibile? 400Mhz DDR, 333fsb cpu?

The rubbers are there to keep pressure off of the CPU Die itself. When fastening down the fan, they keep the pressure off. You can get away with it on some fans, but others are a lot tighter, and WILL crack/crush your cpu:scared:

CPU temperatures 

yes, the rubber circles thingy was a joke ;) (sort of), i just applied some common sense and thermal paste.. when putting it all together. thx guys for your help and encouragements.. i almost forgot how it feels to be helped by others.. oh well, i love this forum ;) cheers, avih

Re: stability checking Prime95 is great but if you also want to do a quick test which puts your system + memory under a lot of strain then also try SuperPI. You can select 1 million calculation which with a fast PC like mine takes about 33 seconds (overclocked). Chances are if it fails this test it will fail Prime95 as well. It can also be used as a benchmark so it's fun at same time to see best score you can get. :D