You should have just clarified your other post rather than start a new one.Download
and run Orthos stress test and see if your quad gets all 4 cores 100% usage.You will
have to copy it so you have 2 folders with orthos in it and run 2 instances to use
all 4 cores as it only uses 2 per instance.I know it says for XP but it works in
Vista.
http://files.extremeoverclocking.com/file.php?f=200