It's a nightmare for designers: Do they share the same buses? How do they access memory? If CPU1 is streaming from memory, can CPU2 access any, or is it cache only at that point? How do they interact with the GPU?
In HD DVD, all access to memory was through the MIPS chip, and there was a proprietary bus that allowed the x86 to request memory and send data, it was complex, painful, and slow. These are not words game developers want to hear.
What if the HD DVD player had its own memory pool and GPU?
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