I have a nVidia (Gigabyte) GTX 670 and a nVidia (EVGA) GTX 580ti. Given that there is a disparity in onboard memory (the 670 has 2gb and the 580ti has 1.5gb - and if memory serves, SLI uses the lowest), would it be worth the trouble (result in better performance) running them in SLI? Or am I better served just selling the old 580ti and running the 670 alone?
Sidenote: At the moment, I'm not really in the market for a second 670. Additionally, I run games on a single monitor at 2560x1600 on an intel 3570k.