Unfortunately DDR3 HD4650s are impossible to find now, new at least. If you are talking about crossfire the HD4650 uses very little power so unless your PSU is terrible it should be fine.
if you buying a new card and have like 180$ or so dont get this card but if your broke pick one up
my cards HDMI port whent out (last night) and it will not go to 1920x1080 any omre and i cannot figure it out
it is a good card but i cannot figure out this issue
can anyone help ?