TechyInAZ :
bignastyid :
No. For SLI the Gpu and vram have to be the same. You cannot sli a 960 and a 980.
GPU is a must but vram doesn't effect SLI options. You can SLI a gtx 960 2gb with a 4gb model, but the downside is that both cards will max out at 2GB.
SLI hasn't worked with differing amounts of vram for awhile. I've tested this with 770 cards and a 2gb card and 4gb card wont SLI.
https://forums.geforce.com/default/topic/469402/