For those of you out there that want to upgrade their Dell Dimension 4700C with a video card,through my research,the highest Nvidia card is the

XFX GEFORCE 8400GS with 256mb on board with total of 512mb Turbo Cache low profile video card.

The card is 16x PIC-E.You will have to buy the XFX low profile bracket kit to replace the mounting bracket.Works great in my Dimension 4700C.Should be compatible with other 16x pci-e card slot Dell systems with small form factor cases.

The XFX card model no I have is: PV-T86S-WAN7.

Regards, Ko