drkohler on 13 June 2016
| Fei-Hung said: On a similar note, they said 320GB/s bandwidth. The PS4 is around 176GB/s I think. Can anyone guess any RAM specs from this? |
There are variuos roads that lead to that value. Coincidentally, the NVidia 1080 has a 256bit wide GDDR5X bus that leads to that value. Being the next generation, I'd suppose MS would want to add some more memory than the existing 8G. So you can get to the 320GB/s using a 320bit GDDR5 bus or a 384bit GDDR5 bus. The first option gets you to 10GB of memory, the second one gets you to 12GB of memory. At some point you pay too much for chips and die space for the gddr5 interface (which is very hard to shrink, and look at the space it takes on the PS4 die!) so I'd guess a 512bit bus is off limits.
My second guess is that the 320GB/s bus excludes any further use of embedded esram as that would be wasted space and costs on the die.
