Despistado Posted July 31, 2006 Posted July 31, 2006 I've been having some problems with the PCIE slots on my expert board. I have 2 Geforces 6600's in SLI but the device manager in Windows XP can only see one of the cards. I know both cards work as I had them in another comptuer in SLI and they ran fine. After these problems I put them back in my other computer to make sure they were working and they seemed fine. Thinking there might be a physical problem with one of the slots I tried testing them with one card and using different settings. When I put one 6600 in the top PCIE slot in 16-1-1-2 mode with dual support disabled i get the vga error beep. When I put one 6600 in the top PCIE slot in 8-4-NC-8 mode with dual support disabled it works fine. The card runs at an 8x PCIE bus on IRQ 19. When I put one 6600 in the bottom PCIE slot in 16-1-1-2 mode with dual support disabled it works, but only at a 2x PCIE bus on IRQ 17. When I put one 6600 in the bottom PCIE slot in 8-4-NC-8 mode with dual support disabled i get the vga error beep. When running both cards with dual support enabled 2-1-1-16 windows only sees one card running at a 2x PCIE bus on IRQ17. When running both cards with dual support enabled 8-4-NC-8 windows only sees one card running at a 8x PCIE bus on IRQ19. After all that im not sure exctly what I proved. I dont see why I wouldnt be able to run one video card in the top slot with a 16x PCIE bus. I've tried some suggestions to fix SLI problems from other threads, but no one else seems to have the problem where windows doesnt see the other video card. Any help would be apperciated. Quote Share this post Link to post Share on other sites More sharing options...
lowboy Posted July 31, 2006 Posted July 31, 2006 Have you tried uninstalling gfx drivers and reboot with only 1 card in 1st slot and reinstall drivers and see what ya get. Quote Share this post Link to post Share on other sites More sharing options...
CPDMF Posted July 31, 2006 Posted July 31, 2006 The dual 6600 option was for a single card with 2 GPU's on it, similar to the 7950. Just enable 8 4 NC 8 and don't worry about the other setting. Use driver cleaner to get rid of all drivers and then reinstall. Quote Share this post Link to post Share on other sites More sharing options...
Despistado Posted July 31, 2006 Posted July 31, 2006 I'll try both of those and get back to you, thanks for the quick reply. Quote Share this post Link to post Share on other sites More sharing options...
Despistado Posted July 31, 2006 Posted July 31, 2006 Ugh, unfortunatley that didnt help. Installing one card and reinstalling worked fine, but didnt help my porblem. Still no luck with SLI. Then I turned off the Dual 6600 option, ran driver cleaner then reinstalled, but I got the same effect as before. Only one video card in the device manager. One thing I forgot to mention is that when windows first boots up I get a balloon saying multi-GPU rendering has changed to independent GPU rendering because one SLI card has been removed. Hopefully this will give someone some more insight to my problem. Quote Share this post Link to post Share on other sites More sharing options...
chobin Posted July 31, 2006 Posted July 31, 2006 i got the same problem BUT: at the beginning i was running with 2 6800GT. Had a lot of crashes: the screen goes black, then pc hangs. I have to shut down and re-power again. If i just hardware restart, the monitor will not receive any signal, but the pc boot normally (i can hear the winodows startup sound). after a while, i changed the settings to enable 8-1-NC-8 option and dual 6600 option enabled.....from that point i've not been able to see the seond card anymore. the mobo is brand new since my SLI-DR died last friday..... i have been trying the clear CMOS for 8 hours, since at te last attempt i got no video signal at all. i powered on my pc again this morning and i saw the monitor receiving the signal again......im gonna try after work if i still have all those hangs. 1 thing: i hve a liquid cooling on VGAs, but the BGA are ooled by normal copper heatsink...could be this the problem? overheating of BGA even in windows without any 3D application running? Keep in mind my GPUs run 13° C less than before (in windows mode 44° C, i got 57° C with previos stock heatsink) Quote Share this post Link to post Share on other sites More sharing options...
chobin Posted July 31, 2006 Posted July 31, 2006 on mnore thing: i don't trust to flash the BIOS because i can have a bad top during the flash.....i don't wanto to mess everything up if not really necessary.... Quote Share this post Link to post Share on other sites More sharing options...
davidk21770 Posted July 31, 2006 Posted July 31, 2006 I would flash to the latest BIOS. Make sure that you uninstall the video drivers, reinstall, and the 1st boot after the video driver install all in safe mode. I understand that this has to do with loaded dlls and the video driver being blocked by a-virus/firewall programs from properly sensing the video configuration the 1st time. My system actually worked SLI'd in 16...2 mode when I forgot to change the BIOS. Lousy benchmarks . Your video cards should work individually in each PCIe slot. If not, I'd suspect the MB or the BIOS. When mine didn't, it was because I had leaked coolant into the PCIe slots . Quote Share this post Link to post Share on other sites More sharing options...
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