A) socket 939 mor future proof and dual core should be a drop-in replacement in socket 939 boards with appropriate BIOS updates.
socket 754 seems to have a lot more longevity than originally planned though, and S754 boards are cheaper than 939.
B)AGP
C)Don't know that much about 64bit prossesors.
D)Absorbs heating coming off hte CPU or w/e
E)?
F)True
G)False
H)Central Processing Unit