cablepuller,
There is a purchase option for dual AMD Radeon 7470 cards, but that seems to be a low-performance card.
* I would call that a mid-range option, not a low performance.
There seems to be no option for dual AMD Radeon 7570 nor NVIDIA GT 640. Is it is true that those cards cannot be used as a pair?
* That is correct using the 275w power supply.
The text on the Dell site states that the GT640 has DP, HDMI and VGA ports, but the illustration seems to show DP, HDMI, and DVI. Would anyone with the GT640 take a look and tell me which is correct? If the illustration is correct, then no adapter cables are needed, just a DP-DP and a DVI-DVI cable.
* Nvidia Geforce 640GT, 1GB, DP/DVI-I/HDMI. There are no VGA ports. The text is incorrect.
* We only offer the 275w power supply on this model.