I have a 3 year old Dell XPS 630 with two 8800GT video cards in sli configuration. I recently noticed games started to lag and stutter. i updated drivers to latest version but still a problem. I just went to device manager and noticed second video card had a yellow flag and said " Windows has stopped this device because it has reported problems. (Code 43)" Is there any test i can do to find out the problem or do i need to replace the card? I googled to find another 8800GT but Newegg and Tiger Direct and the like are out of stock apparently none has made these cards in a while. If i replace the card, can I use another model for the bad card or do i have to buy two new cards.? I always thought you had to have exact same model for sli to work. Any suggestions?