Originally Posted by Durante
360: 22.4 GB/s + eDRAM for framebuffer
PS3: 25.6 GB/s main memory BW + 22.4 GB/s graphics memory BW, no eDRAM
GTX 680: 192.2 GB/s :P
PS3 VRAM may be a bit slower because apparently they reduced the speed to 650MHz in the final spec.
Also, the eDRAM on 360 has a 32GB/sec link to the GPU, but its internal bandwidth is over 250GB/sec.