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ethomaz on 06 March 2014
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Kynes said:
ethomaz said:

Kynes:

You shouldn't guess/compare with 720p or 900p requirements, because you don't have the graphics development knowledge. That conclusion on the DDR3 is wrong, coping 960x1080 images from - to RAM isn't very bandwidth expensive.

It is... you need to move these 4 frames at least 60 times per second and create the framebuffer to work on before to send to screen... you can't do that on PS3 or 360... I guess you can't too on Xbone because the eSRAM is limited to 32MB that is already not enought for the frame buffer.

A single 32 bits per channel 960x1080 rgb image weights less than 12 MB, copyng from - to 4 of them, 60 times per second uses less than 3 GBPS, much less than the 68 GBPS of the X1. This is a worst case scenario, taking into consideration that no one uses 32 bits per channel in gaming, and I'm not taking into consideration color compression. Using 8 bits per channel you use more or less 1 GBPS on this, something I'm sure it's doable.

It not work like that... you are working in a eSRAM frame buffer and so you need to go to DDR3 to read/write information while you work with it... in PS4 you already have theses India in the main RAM... in Xbone not... you have addictional read/write cycles not found on PS4... you are using Xbone bandwidth to others things like textures for example and you need to travel everything between main RAM and eSRAM... so add more these tasks will compromises and at the end devs will need to sacrifices something.

This won't work on Xbone for native 1080p framebuffer... maybe 720p or 900p that is not what people here are expecting.