Terbinator
800MHz RAM.
I.e., DDR3-1600. The real issue is the 12.8GB/s bandwidth. However there is meant to be quite a bit of eDRAM on the GPU so hopefully that isn't a big issue.
Personally I think the hardware is just a little bit cut down than it should have been. The CPU die is miniature - surely room there for more cores or a large L3 cache to offset the low-bandwidth main memory.
Still, ~30W when playing games is pretty good.