its not unbelievable to think that you could max out 3 gig in the future (i think some current PC games get to around 2, and conversely, the 720 has less bandwidth. so they both could have future, but distinct, limitations.
i'm talking well down the line though...
Comparing memory usage of PC games to console games isn't the way to go. Arguably the best open world game of last gen GTA SA was running on 32mb RAM on ps2. Similarly all console games are optimized to achieve equal or better results than PCs for less memory
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