| iamdeath said: ddr3 is NOT better for latency...period. |
Micron's DDR3 PC2133 has a typical CL14 read latency specification but possibly set as low as CL11 on the Xbox One.
Hynix' GDDR5 (I don't know which brand GDDR5 the PS4 will use but they will all be more or less the same.) has a CL18 up to CL20 for GDDR5-5500.
Now with GDDR5 the data rates are 4x faster than the IO clock instead of 2x, I.E. 5500Mhz GDDR5 is 1.375ghz x4 and would have a CAS Latency of 18-20.
18/(1.375 GHz) = 13 ns at a minimum.
Typically DDR3 has a latency of 10ns.
So one can assume the Playstation 4 has a latency that is 20-30% higher than the Xbox One.
We also cannot discount what effect the eSRAM has on latency as it is essentially a chunk of memory that's close to the GPU and CPU.
However with that in mind, there is a reason why CPU's have L1, L2 and L3 and sometimes L4 caches, it's to hide latency and bandwidth deficits by having to travel all the way down to system memory.
GPU's however really don't give a crap about memory latency and they also have L1 and L2 caches too.
So in the end one can summise that any potential latency deficit the Playstation 4 has isn't going to mean squat in the grand scheme of things.
And for gaming, which the Playstation 4 is designed for, Memory Bandwidth > Latency.
--::{PC Gaming Master Race}::--
