shortref, that is pretty darm cool IMO. then again i don't have any experience of core 2 duo's personally but in a room temp of 19 degrees my x2 4400 idles at 30C and a load of around 39-41C.
again though, to the OP, we would need to know your case, CPU and ambient room temp befvore saying if that is too hot, however, unless that is a p4 i say far too hot.
------------------------------I'm a git, deal with it.
hmm, i am not a fan opf leaving case sides off as it doesn't really provide any more airflow. i prefer the front to back airflow myself.
the stock HSF's are good enough IMO, but you may wish to replace the thermal paste. anything will do really. just use a sandwich bag, spread some on the heatsink first of all and then wipe off against the grain, then agian using the bag spread a very thin layer on the CPU's heat spreader, note it is best to have a very thing layer, it does not need to be a solid finish. if you can still see the CPU's heat spreader that will be fine.
------------------------------I'm a git, deal with it.
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