I have a Dell optiplex GX680 with a pentium d805 @2.66 ghz. Would a penium d 945 be a good upgrade? I'm pretty sure this is compatible, tho I have never done a cpu upgrade. What I'm really wondering is how an e6850 or an e8400 would work. Would I have to change bios? Are the e series chips compatible with this mobo? I understand the e series chips run cooler and faster than the pentium d chips but I don't want to buy one if they won't work on this board.