Some more RAM talk.
We currently have:
- 4 GB 5500MT/s GDDR5 (8 chips) on a 256bit Bus
176GB/s, ~60$ for RAM (from earlier in this thread)
with the performance target in mind, the options are
- 8 GB 5500MT/s GDDR5 (16 chips) on a 256bit Bus (clamshell mode)
176GB/s, ~120$ for RAM (similar main board cost as above)
- 8 GB 1333MT/s or 1600MT/s DDR3 (16 chips) on a 1024bit Bus (stacked WideIO)
170GB/s or 205GB/s, ~30$ for RAM (stacking tech cost, yield?)
- 6 GB 6000MT/s GDDR5 (16 chips) on a 192bit Bus (clamshell mode)
144GB/s, ~100$ for RAM (redesign memory controller)
- 6 GB 5500MT/s GDDR5 (16 chips) on a 384bit Bus
264GB/s, ~90$ for RAM (added mainboard complexity)
I cannot see how you would achieve this (see above)
It's possible that they have 2 prototypes ready, but I think that they wouldn't switch tech mid-gen. Latencies and bandwitdh numbers would be different.
Easily doable with WideIO, see above
Sony won't use Rambus memory. They're fabless, and no fab want's anything to do with them at the moment (see
Wikipedia)
Easy with stacked RAM (use 8GB 1833MT/s DDR3 on a 1024bit bus)