Doesn't that review on cnet state the best video card this unit is capable of is the ATI 3450? I am guessing that is/was the best Dell was selling at the time. This is a x16 card, so as long as the P/S is strong enough the sky is the limit.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70