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I had a NVIDIA GeForce 6500 graphics card that was working great (I had one screen using the DVI and one using the S-Video), I just installed a new NVIDIA GeForce G210. The new card seems to work but I can't get anything from the old one now, it just sort of flickers, and when I try to do an extended desktop from one of the screens on the new card to a screen on the old everything goes black and windows restarts... Any ideas?

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Verify you can mix and match NVIDIA cards like that. Its my understand that you can only connect two different NVIDIA cards if they are the same or similar model. –  Ramhound Feb 16 '13 at 22:46
    
How could I verify that? That's where I started and I wasn't able to get a good answer. –  Blake Feb 16 '13 at 23:02
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up vote 3 down vote accepted

Due to the fact that these two cards do not use the same chip-set they will not run together. Sorry but you will have to choose one or the other. In order to run in SLI they must meet these requirements.

https://forums.geforce.com/default/topic/469402/sli/faq-quot-will-these-two-cards-work-in-sli-quot-sli-what-works-with-what-/

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Thanks for the clear answer! I took your advice.. the G210 won. –  Blake Feb 17 '13 at 1:59
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Whoa whoa whoa. It's true that they cannot run in SLI, but they certainly CAN operate separately, powering different displays. I have personally accomplished this with a GTX 580 and 9800GT. From the description of what happens from @Blake it looks like more of a hardware malfunction (power supply, motherboard) to me. –  Chris Stauffer Feb 22 '13 at 17:41
    
@ChrisStauffer Clearly they aren't playing nicely. –  Griffin Feb 22 '13 at 21:10
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