Well, wrong or not, I think this is a good way to compare systems.
I have a 120gig Maxtor 7200RPM and I installed a side case fan mod to help keep the HD cool.
And it seems my temps for cpu/mb are right on spot with everyone else's, so the person who said the temps actually rise with the change in air circulation, I dunno man.
I got mb45/cpu54 after 1 and a half hour of playing Need For Speed with my own music, game running completly off the HD.