The AGP socket is keyed for universal 0.8v AGP cards that comply with the AGP 3.0 specification or 1.5v AGP cards that comply with the AGP 2.0 specification. The AGP connector supports 8x and 4x AGP 3.0 add-in cards operating at 0.8v, or AGP 2.0 add-in cards operating at 1.5V.
*NOTE: There is no support for AGP 2x operation or legacy 3.3V AGP cards.*

Confirmed video cards (most didn't require a upgraded PSU):
OEM Matrox P650 AGP, Visiontek Radeon 9600XT, MSI Geforce4 TI 4200, ATI Radeon 8500LE 128MB,
ATI Radeon 9000 PRO 128MB, ATI Radeon 9600XT 128MB, 128MB NVidia FX5200,
128MB NVidia FX5600 Ultra, 128MB Sapphire Radeon 9600 Pro, Nvidia GeForce4 Ti 4400,
ATI Radeon 9200 AGP, ATI Radeon 9800pro, ATI Radeon 9700pro, Nvidia GF FX 5200,
GeForce4 MX 440 64MB, Gainward GeForce2 GTS/PRO 64mb Golden Sample, evga geforce fx 5600,
ATI 9000 All in Wonder AGP, ATI 9800 Pro AIW, Gainward GeForce 3 Ti200 Golden Sample,
MSI Geforce 4 Ti4800 128MB, CHAINTECH nVIDIA GeForce FX5200, Powercolor 9600xt Ultra 128MB,
ATI Radeon 9200SE 64MB, GeForce3 Ti200 64MB, Asus V9520Magic/128MB FX5200,
Asus Geforce 2/32Mb , ATI AIW Radeon 9000, ATI AIW Radeon 8500DV, 128MB Sapphire Radeon 9600SE, Gigabyte GF2 MX, MSI FX5900XT 128MB, Wildcat VP990, ATI 9700 non-pro, ATI 8500 AIW, ATI 7200, ATI 9100 Pro, etc

Pretty much any agp or pci card that you can buy at the moment will work. I am currently running a Leadtek Winfast A6600GT-TDH 128 MB, 8X...FAST, COOL, and QUIET!

Remember to change the setting in the BIOS to AGP or AUTO. Uninstall your old card driver, boot to SAFE mode and run a driver cleaner; power-down and remove your old card; insert your new card and power-up; install the new driver...it's that easy :)

hi,

I have  already started a search thru Dell community forums and this is one of the posts I have read. There used to be a non-Dell forum (poweredgeforum.com) which dealt with the Dell 400sc server, but it doesn t exist anymore. In there there was a list of video cards which worked properly for members with the OEM power supply. I had already known that the BFG 6800GT would work before I bought it. I have tried to contact a member of the Dell community who had a similar problem with the 7800GS video card. He found out that the first 7800GS card was defective because it didn t work even with an Antec 550w power supply. Now did he ever test his new 7800GS card with his OEM power supply, that is the question?