shikamaru317 said:
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Could be. I mean 68GB is 79% of 86GB, so it can make the difference between 47fps and 60fps, which is not so small when you look at it like that. Plus that 68GB/s is shared with the CPU so GPU doesn't get to use 100%.
Also the eSRAM is great, but it may be too small to do 1080p depending on what kind of rendering they're doing, so that size constraint may be what caps the game to less than 1080p.
Killzone Shadowfall apparently used 800MB of render targets. That's a lot more than 32MB...
http://www.guerrilla-games.com/presentations/Valient_Killzone_Shadow_Fall_Demo_Postmortem.pdf
1080p G-buffers with antialiasing don't fit in 32MB. Then have to draw things like shadow maps, and then copy them out of the eSRAM to make room for other stuff, which consumes DDR3 bandwidth and blocks things. etc. etc.