Originally Posted by Mals
Crappy. I wish I'd known that about SLI before buying my first 670. 2GB of Vram I guess is being used up by games like Max Payne and BF3.. although I doubt I ever go that nuts to set EVERYTHING on ultra.. that is kind of sad to know that it only uses the VRAM from one board =/
Just to be clear, SLi is not 'just using the vram from one board'.
The reason that the overall vram capacity does not increase with more cards (or by mixing in a single card with more vram) is that same data must be stored (aka Mirrored) in the memory bank of all cards in the SLi set. It works much like hard drives in RAID-1 configuration.
So overall you're limited by the memory capacity of the 'smallest' (memory-wise) card in the set. And that's IF you even get two cards with mismatched memory amounts to work. Usually you can but it takes some finagling.
Also, even in SLI the 670 2GB has plenty of vram for anything short of Skyrim w/massive texture mods or something similar. Max Payne 3 and BF3 ... you're probably gonna run out of GPU grunt before you start to suffer from bottlenecking due to vram amount in those games.Edited by brettjv - 6/5/12 at 12:24pm