why even bother with 4gb? pardon my ignorance but i was under the impression that nothing of today's generation will be bottlenecked by 2gb vram. there are some reviews that suggest that 1.5gb is a bottleneck, but then they use inferior cards, and claim the fps drop is because of vram... and as for future-proofing, surely the actual card performance would be obsolete by the time 2gb of vram are needed in games?