JM Popaleetus
Senior member
This.DefRef: What's the difference between the 580 and 680? That should give you a guesstimate of the jump since your first post said the 460GTX SLI and the 580GTX were about equal. I have 2 460GTX 768s in SLI in rig 3 below and they work great. I bought a 6970 for rig 2 at Christmas (had gift cards) and it has the advantage of 2G Vram and is very smooth but those 2 460s (eventhough only 768Vram) are warriors! SLI has not been a problem. If the urge is strong and you can get a decent price for your 460s go for it.
The same metric I used to decide that the jump from my two 6850s wasn't quite worth it yet.