I just purchased the Gateway DX4831-01e and I love it. To anwser your ???'s Here is the list of mods I did. and it screams
#1 PNY GTX260 NVIDIA CARD
#2 CORSAIR 750WHX PSU
#3 80MM CASE FAN (NO CASE FAN AT ALL COMES WITH IT)
SO YES, THE GRAPHICS CARD WAS NO PROBLEM.