Ok, so my bro has my old comp and he mainly just wants to play 1080P video on his Dell 2408WFP, with the odd game here and there. The current specs are as follows:-
2 x 2.0GHZ Opteron 246
2GB DDR 400
600W PSU
Tyan K8WE
MSI 6800GT
Running XP SP3
Now, he's looking in the price range of either the 4850, or the 9800GTX(+). Which would offer him better HD playback performance? And would either of these cards really be all he needs to upgrade to get good 1080P playback?
Thanks in advance guys.

