Will a 9800GTX work in SLi with a 880GTS? The 9800GTX is less that the 8800GTS right now ($200 for a 9800 and $230 for a 8800). I am aware that the 9800 would slow down to the speed of the 8800, but will this work?
Do the cards have to be same model?
I answer it with an example:
You have a NVIDIA Geforce 7800GTX 256, and you want to add another card,the second card has to be 7800GTX exactly.
But what about the memory? Can you add a 7800GTX 512 and use that with 7800GTX 256?
It's recommended to use a 7800GTX 256 with a 7800GTX 256 and 7800GTX 512 with 7800GTX 512.
However you can use a 7800GTX 256 with 7800GTX 512 , BUT the 7800GTX 512 will lower its clock to operate with the 256 one, so it wont have its true power. (This option isn't recommended )