I installed a second evga 9800gtx in my pc about three days ago.
Everything went smooth drivers installed fine when i rebooted vista it showed the sli bubble and i could enable it in the nvidia preference.
After i did that the most games crash in the first 5 sec of loading (gta4 nfsu),
wow and l4d are running fine for hours but im not sure that they using sli.
i tried both cards in the first slot as single gpu's and they work fine as soon as i add the second card with or without the sli bridge the games don't load.
thanks for any help i tiry to find a solution for the last 2 days
evga 750i ftw
q9450 no oc
8gigs of ddr2 ram
ultra lsp 650 pro
2 dvd drives
2 1tb hdd
and all that in a tempest gaming case with all the fans
If you can, monitor your motherboard voltages and look for any dips. Your setup may be pushing the limits of your 650 watt PSU. Once both those cards come out of 2D downclocked mode and spin up to start handling 3D it may be exceeding the capacity of your PSU. Another issue that may be present is if your graphics cards are not from the same vendor or they are but both cards have different firmware. A good general rule to follow with SLI is if your gonna use two cards buy them at the same time.I know it was supposed to also be a buy now upgrade/add later type option for GPU's but that isn't accurate. Many problems can come up if your not using 2 identical (brand,firmware) GPU's.
k with the psu if that would be the problem should my whole pc crash and restart? because now only the game does pc runs fine
and like i sad in my first post left4dead runs fine for hours which also takes up a lot of gpu perfomance right?
is there anything i can test if one card is faster then two?