crt1530, there is some controversy on whether or not an Antec PP303X can handle a 1.4GHz Athlon system (look at Cases and Cooling forum). I tried getting info on why AMD hasn't approved it past 900MHz operation, but no one has clear answers (including an Antec representative that browses that forum). You might want to get the PP303XP, a tweaked version of the above with a higher combined 3.3 + 5.0 voltage line rating. Or, go with something on AMD's approved list.