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ethomaz on 06 April 2013
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drkohler said:
Machiavellian said:
drkohler said:
ethomaz said:

... the CPU have only 20 GB/s access to the RAM...

where does that number come from?


Not sure about the PS4 but that is the quoted number for the Durango CPU.

That is why I am wndering who is quoting numbers out of the blue..

All we have is a theoretical number (176GB/s in case of the PS4, 76GB/s in the case of NextBox). This number has no relevance at all about what is actually going on on the address bus when gaming. Sure I can make a rough guesstimate, with an 60fps game at 1080p, gpu messing with frame buffer(s) will eat 80% of the bus cycles, and so the PS4 cpu gets roughly 35GB/s (again purely a theoretical limit). But suddenly a 20GB/s number pops into existence like a gospel..

Sony itself said at GDC... there are a lot of articles about and I linked the DigitalFoundry one.

GPU max bandwidth: 176GB/s
CPU max bandwidth: 20GB/s