I've been researching this subject all day, but I'm still not quite sure... I have an HP dc5100mt with a 3.2 single core P4 cpu. The motherboard is an Intel 915GV. I've been seeing these 775 chips for under $10! So, which one is best? Is there a list somewhere that shows which will fit and which won't? And... if you also have some good info about a decent QUIET 775 fan on the CHEAP, that would be great too. Thanks!