I have been looking at AMD Athalon motherboards... and there are different types. I am looking for an Athalon "C", 1.33ghz, Could someone explain to me what the difference between Slot A and Socket A are? Which is Better? Also... I always see posts of "T-Bird", is that a type of Athalon or a brand... or what exactly is a T-Bird? Thx for the help.