There were several revisions of the motherboard used in the IQ8xx series so it varies.http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01635715&lc=en&cc=us&dlc...
But in general they're pretty picky about replacement CPUs
What was the latest intel processor offered on the IQ 800 SERIES?
Exp Intel core 2 duo P7570.
This thread http://www.touchsmartdevzone.com/forum/thread/1139/Upgrade-CPU/ is pretty much the main discussion over a long period of time about what does and doesn't work on these machines...
I noted that I updated the CPU on my EVE motherboarded IQ5xx to a T9500 way back when... I am typing on that very computer right now, so I can say that it definitely works. I never did upgrade the wife's computer (which has a Maureen board in it instead of the Eve board)... never needed it for what she does with her computer.
Again, read that link, there is a lot of good info still to be had there.
Paisley Pirate
-Illigitimus non carborundum est
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