cyrnel

775...? The temp limits vary by a few degrees depending on specific model.

Here's a good specification summary with max temps:

http://users.erols.com/chare/elec.htm

Search for "P4-xxx" where xxx is 571, 670, etc.

I'd want to know working temps. Fire up the http://folding.stanford.edu/download.html client for a couple minutes.

You mentioned there wasn't anything under the HSF. There should have been a small square pad of conductive material. It's protected until you remove the heatsink from the packaging. If you don't have either a pad or grease, or if something got stuck to the pad, then that would cause high temps.

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