the GTX 670 will play most games at around 45-50 fps at 2560x1440 resolution with the settings maxed out.
Unless you're running heavily modded games (like heavily modded skyrim), 2GB is more than enough. Most games won't even approach 2GB of vram usage unless you're doing a triple monitor set-up (5760x1080 or 3240x1920 resolution)
just look at the memory usage....http://www.xbitlabs.com/articles/graphics/display/evga-geforce-gtx-670-4gb.html
Thanks for the article, basically gaming at 2560x1440 with 4GB or 2GB of vRAM makes no difference and the extra memory only comes handy when you use triple monitor setup.
However, if I have World of Warcraft with max setting in full screen windowed mode at 2560x1440, and then I open another WoW with max setting in full screen windowed mode at 2560x1440, does the extra 2GB help in the situation? I guess what I'm really asking is, instead of increasing resolution like all the benchmarks out there to find out the performance boost of 4GB vRAM, does having multple games running simultaneously benefits from extra vRAM.