well I don't know if this will work but you could put a quadro card in your spare pci-express x16 slot no to sli but to run independently I have never heard of anyone doing that though. The 8800gtx is a gaming card whilst the quadro is for workstations it is more suited for your design work but they do cost the same as a small child
what case do you have khan???
i have the Zalman HD160XT
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Enermax Galaxy 1000W EGA1000EWL ATX2.2 Modular PSU.
Creative Sound Blaster X-Fi Elite Pro 7.1 Soundcard.
Zalman Reserator2 Fanless Water Cooling System.
(2x) Seagate Cheetah 10K.7 300GB ST3300007LC 10,000RPM SCSI 8MB Cache (Ultra 320-SC2 80 Pin).
Crucial 16GB (4x4GB) DDR2 PC2-5300C5 Dual Channel Kit.
Asus Striker Extreme nForce 680 (Socket 775) PCI-Express DDR2 Motherboard
Intel Core 2 Quad Extreme Edition QX6800 "LGA775 Kentsfield" 2.93GHz
LiteOn LH-2B1S-490C 2x BD-R/RE Blu-Ray SATA DVD Writer
BFG GeForce 8800 GTX Extreme WaterCooled 768MB GDDR3 HDTV/Dual DVI
Zalman HD160XT-B Home Theatre PC