I posted something similar a few days ago (RH8 runaway).
I had made a fairly big install, and it consistently went berserk after a few hours. (Posts on how to use "top" and "ps" were helpful--thanks.)
I decided to re-install (desktop default), and---for a few days__things seemed stable. Then, this AM, it locked up doing a tar -x. could not get any control back (I did jump to command line on ctrl-alt-f2, but it was unresponsive to any input.)
As with the previous incident, the HD light was stuck on.
Abit kr7A-133R, four 40g maxtor ata 133 in 2 level 0 RAIDs
(this board has the Highpoint 372 RAID controller, and I used the patches supplied by sharkyrOlz (see the hardware forum)
does any of this match up to other reported RH8 issues?