is there a real benefit for going for the 3GB you may ask, no.
Why? you may ask well here is one of the main reasons;
The core struggles before the vram is really fully utilised, as a result the extra vram adds little to no help, even as the resolutions and vram requirement increases.
People may say "But Battle field 4 and Watch dogs require both more then 2GB Vram, so it is needed", does it really...no it does not, why, because it can't be utilised and it is not due to the memory bandwidth not capable of it, as they aren't related as much as they sound they do. The Core is not capable of really taking advantage of the extra 1GB, hence the reason why they aren't that popular with people who buy the cards.
For an example, why do most people only buy the extra Vramed cards when doing multi-GPU'd builds? Since Vram isn't added, having 2GB+2GB=2GB, so when using two graphics cards people tend to want 4GB+4GB=4GB, and take advantage of the extra Vram capability due to the core's ability to really take advantage of it and really utilise it. They do this as the difference is noticeable as if they bought the 2GB models it would be limiting them as the examples of games listed above would benefit from the greater Vram.
Just for the information.
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