Ordered GTX 670 Windforce last night, but I just cancelled it as I was thinking of waiting for a 4gb version. I think the 4gb will be more future proof. Can't really decide atm, I might order another one later... arrggghhh!!!!
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Max payne uses 2.7GB at 1440p, you really need to stop giving advice if you dont have first hand experience.
So OP 4gb would be better, except Nvidia are way overpriced and therefore not worth it. For an extra 2GB they're charging an extra £50-100, only fools would consider it!
What res are you currently playing at, and do you intend on going to a higher res screen or multiple screens?
A single wf 670 copes pretty well at 1920x1200, (same card and res here). Bf3 on max settings im averaging 70fps, card oc'd to +120 core, +760 memory. Vram usage of 1500mb ono.I'm currently playing 1920 X 1200 but I plan to go 3D.
Will you be planing in the future to use a multiple monitors for 3d ?
http://www.nvidia.com/object/3d-vision-surround-technology.html
then why does the 2gb 670 perform much better than the 3gb 7950 at 2560x1600
The main reason being they are both different architectures, the other reason being one dynamically boosts from 915MHz to ~1GHz and the other is tested on a static ~800MHz(don't take this as a ones better than the other, that's not what I'm explaining/talking about).
Regardless whether the extra vram is needed, it's absolutely pointless comparing 2 different architectures in the way you are, much the same as the 6970 v 570 vram arguments of old in regards to BF3.
Now if your examples were of a 2Gb 670 v 4Gb 680 using 8xmsaa then fair enough, take it from there.
Add the fact that 2x6950>70's@stock can play on those settings@1080p(8xmsaa with everything on max), then for the life of me I don't know why both reviews couldn't, they could even have used overclocked cards!
Game is max payne 3