MSI 680i + SLI'ed 8800GTS 320mb = Not working

[Xazax]

Ok, so im building a system for my buddy and he has two 320mb'd he wants to SLI on a 680i, i got him an MSI P6N Diamond with Onboard X-FI i figure he'd like it, well its a decent motherborad confusing BIOs options for OCing but still was able to OC just a little bit but my biggest problem seems i cant get the 8800GTS 320mb's to register in SLI.

Im using 64-bit Vista with 175.16 Drivers,

I installed 1 8800GTS 320mb loaded the drivers, Shut down.
Installed the second 8800GTS 320mb loaded to windows let it read and install the card then shut down.
Finally i put on the SLI Bridge between the cards and reboot one last time upon entering windows there is no option at all for SLI in the Nvidia control panel yet Vista is reading both 8800GTS 320MB just fine.

Now this particular motherboard has x4 PCI-E slots well i followed the manul but both cards in the White x16 Slots at first with no luck, well i moved on 8800GTS 320MB to a yellow slot and still doesnt work.

Some help.. im really stuck on why i cant get SLI working.. i mean its a 680i?

(Note: i'd figure i put this in General section since its dealing with both motherboard and Nvidia SLI issues)

 

[Gallatin]

is this the "right" way or just the best way? i do format once in a month (i like it) in my 8800gt's i just install the drivers go 2 times black the screen, reboot, it pops up a notification "you have sli capable system", i enable it and thats about it.

 

[Xazax]

I never get those pop-ups :/

 

[Gallatin]

than i can't help you....
maybe a clean install of win and drivers? that will narrow down any software problems that may exist. but leave the hardware as it is.