Xbox One:
While I read many differing opinions on the ESRAM. The one sure thing is that the "peak" isn't sustainable or even achievable.
Your probably right that it will be around 60-75% of the "peak". That fast memory still has to wait for the slow memory. A bottleneck is created.
PS4:
You did get the bandwidth wrong. Those figures are for access to memory. While the GPU has full access, the CPU does not. While both are using the memory pool, one will get more access or less... Depending on the needs.
In other words memory bandwidth remains the same. Only access changes.
VS:
PS4 is still the stronger console. Even with the GPU and CPU uptick on Xbox One. Before that time, it was 33% faster. But we still don't know PS4 CPU speed.
Conclusion:
PS4's GPU is 27% faster. It's CPU is either slower or faster then Xbox Ones.
Given the less importance of CPU speed for graphics rendering. The preformance gap is in my estimate 25%, in favor of PS4... If the CPU is infact of less speed then XBox Ones.
Reversed, if found that PS4 CPU is 1.8 GHz or the rumored 2 GHz. The preformance will remain 27% or higher (29%).
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