Radeon 7950 vs. GTX 760 (Does memory matter?!)

Quote from Hardware Canuck's review of the Galaxy GTX 770 GC 4GB:
"If I can veer a bit off course for a moment, the realities of today’s games and tomorrow’s applications need to be discussed before going too far into the GC 4GB’s successes and failures. With the optimizations in DX11, even the most demanding games are requiring less frame buffer capacity than ever. Next generation DX11.1 equipped console development will bring the focus towards a further streamlining of game engines, so highly detailed environments won’t require memory hogging, inefficient high resolution texture maps. As many game developers have already stated on and off the record, this will lead to an increase in the amount of raw processing power required to render a scene and a significant drop in the local memory requirements. What does a situation like this mean to cards like the GC 4GB? Now and in the future, its core processing performance will likely become a bottleneck long before more than 2GB of 7Gbps memory is required to provide a smooth gaming experience.

Naturally, the GC’s primary selling point is that 4GB of GDDR5 which panders to an odd theory some have that more memory is always better. The additional allotment may arguably be beneficial to framerates at even higher multi monitor and 4K resolutions but we’d beg to differ. As we’ve seen again and again, increased memory size will hardly ever allow a card to return completely playable framerates where the reference version could not. The reason for this is simple: the architecture itself becomes a bottleneck long before framebuffer limitations are reached.

In the grand scheme of things, at ultra high single monitor resolutions, the 4GB of memory really doesn’t make all that much of a difference in average framerates. However, in some rare instances like Crysis 3, it prevents framerates from plunging down into unplayable territory every now and then and that makes a huge difference in perceptual onscreen performance. That’s actually quite important since a sense of fluidity can be maintained without resorting to higher clock speeds."
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/62594-galaxy-gtx-770-gc-4gb-review-9.html