That system comes with a power supply that has a Output Wattage: 305W maximum continuous.
The EVGA 7900GT requires:
Minimum of a 400 Watt power supply.
(Minimum recommended power supply with
+12 Volt current rating of 20 Amp Amps.)
Minimum 500 Watt for SLI mode system.
(Minimum recommended power supply with +
12 Volt current rating of 28 Amp Amps.)
The
bold above is the key
: Amperages not wattage.
Your motherboard has the following:
2 PCI slots
1 PCIe x 1 slot
1 PCIe x 16 (graphics) slot
So yes that card would fit, but may not work.
Dell Power Supplies are
proprietary
This card will work well with your existing system:
Radeon® X700 PRO for PCI Express http://www.newegg.com/Product/Produc...82E16814102414
http://www.pcper.com/article.php?aid=74&type=expert