P7n, 2-card sli, 3rd card for 2nd monitor

Anyone got 2-card SLI and a 3rd vid card for a 2nd monitor working?
System: p7n, 4GB OCZ Vista gold PC-6400 RAM, Pentium D930 for testing, 2 MSI NX8800GTs, Vista x64 installed, SB Xfi that's included with the MB, one 500gb WD SATA hard drive and an IDE DVD. I plan to move my RAID card over from my eVGA system in my sig if I can get this working...but I need more than 1 monitor.
Nothing overclocked!!
I can't get SLI to work with a 3rd video card. I've tried an eVGA 8400GS...no SLI option in the nVidia ctrl panel, eVGA 8500, no boot, the fans spin for a fraction of a second, and the leds flash and that's it, and an ATi 1800xtx...errors in Vista about incompatible hardware.
With the 8400GS, there's no longer any option for SLI in the nVidia control panel, which there was with only the 2 8800GTs on the previous boot.
I've got a 650W PS with dual PCI-E leads, and the system is currently pulling less than 300W, so this shouldn't be an issue.
I've built hundreds of systems, but this is my first SLI system. Any help would be greatly appreciated.
Also, the MB will occasionlly fail to boot with just the 2 8800gts, I just get the fan spin/led flash. Bad motherboard? The only way to get it to boot again is to pull one of the8800gts and restart, sometimes the bios needs to be reset.
psu specs:
650w
+3.3 30a
+5 54a
+12v1 20a
+12v2 20a

Got the solution I was looking for via the forums at nvidia.com from jaafaman
http://forums.nvidia.com/index.php?showtopic=60345&st=0&p=330530&
The third card works best as an nVidia so it can use the same driver. Right now, I'm using two 8800GTS640s in SLI and a 6200OC as the third, with a 20" WS for the SLI and two 17" WS attached to the third card.
And to date, Vista is the only OS where this is possible!
Start by mounting the cards, installing the one single ForceWare driver and mounting your monitors as above. Make sure your monitors are working in non-SLI mode before setting SLI up.
Open the Device Manager, and under Display Adapters you will see all three cards listed. Right-Click on the third card's entry and choose the "Disable" option. Close the Device Manager and reboot the system.
Once Vista fires back up with the third card disabled, the option to run SLI will show up in the NVIDIA Control Panel. Enable SLI as you normally would, and regardless of whether or not you have to reboot to enter SLI, once SLI is enabled you must reboot at least one time so that Vista starts up with SLI active.
Once SLI is enabled and Vista has been rebooted, you can open the Device Manager again and re-enable the third card.
At that point, you can do whatever you need with the other monitor(s) as you normally would. You can't extend the SLI rendering to the extra screens, but you can still extend the Vista Desktop, etc. and run apps or child windows as you normally would.
To get out of SLI, reverse the process. The key is in having the third card DISABLED while enabling or disabling SLI with a reboot.
A poster named Fredrik finalized this process as an illustrated guide in the SLI Zone and it was "stickied" there for permanent display. Oddly enough, the Guide is labelled Guide: Run Multiple Monitors with SLI, Vista, 3 Nvidia Cards, 2 cards in SLI and one for up to 2 other monitors. As one of the original participants, the title of your own thread is what caught my eye. Thought maybe someone else had discovered this as well...

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