"Bandwidth is a problem if you do a lot of post-processing effects and more if you share it with the cpu."
True. But they could have done two 128 bit busses like PS3.
I understand, 256 bit seemed too expensive.
Not trying to be militant.
Here's the simple points an EDRAM defender needs to prove, that not having it would have otherwise crippled the system. Or show bandwidth limited benchmarks at around 720P.
Otherwise, it does nothing.
Let me put it another way, if X360 is not putting out better graphics than PS3, the EDRAM failed, plain and simple.
After all, MS paid for more transistors in the GPU than Sony did.