There is no way your full load CPU temp is 33 degrees. That sounds more like system temp or CPU idle temp. You probably need better cooling to start out with. Like Mica says, adjust your memory down to the lower "3X" setting in the BIOS. If you have an older 1.8a, then 2.5 gig is probably about the best you can hope for. The newer 1.8a will often hit 2.7 gig. Not many 1.8a CPUs will reach 3 gig unless they are the new stepping or the optical shrink core.