Any recommendations of anything better, if I actually can replace the graphic card, etc. Thanks =)
I know this post was in April this year but I thought I share my experience with others.
I happen to own the Dimension 9200 with the E640xx processor. Upgraded the GPU to an ATI 5770 which uses only one 6-pin PCIe power connector. Run as well as I expects, compared to the 8600GTS that came with it.
I did look into getting a GPU that needed 2x 6-pin PCIe power connectors but the power reqirement worried me. Didn't think the 375W Dell PSU was up to the task. Then I looked into changing the PSU but the "difficulty" of taking out the Dell OEM PSU and its cables looked too daunting that I gave that idea a miss (I think I would have to take out the motherboard to do that).