SLI 8800GT problem(s)?

I've been away from the Computer Hardware for quite a while but i retained some of my computer knowledge!

I rebuilt my system to 8800GT SLI run 3dmark06 and scored 12.7K ish. thats with SLI Disabled. If I enable SLI i would still get the same Score so i reinstalled my drivers, renabled SLI and i would get the IDirect3dDevice:: Present Failed. But if i disable SLI, 3dmark would rum all the way and i'd still score 12ish K.

System:
ASUS M4N72-E
AMD Phenom X4 955
evga 8800gt
gigabyte 8800gt
3gb ddr2 ram
680W PSU

yes the two cards are connected by the SLI bridge aaahahha and are PCI-E powered

I am going to bump this for you. BUMP!!!!

tnx

is one of my cards defective??

i realised that i would get NVLDDMKM STOPPED WORKING whenever i run 3dmark06 or games like BF Bad Company 2. If i enable SLI, 3dapps would freeze and crash causing nvlddmkm error. if i disable SLI i can run the 3d apps likes longer. ive been playing BFBC2 for a couple of hours before it crashed compared with SLI enable i only last a minute at most.

Try testing the other card without SLI to check if that card is working fine.