Q:

Windows 8 won't run two NVIDIA cards simultaneously

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?

A:

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-/

