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OK, found this in a ArsTechnica forum on the same topic of trying to emulate the PS2's GS chip in software:
posted by milan616 on 10/05/07
So if accurate, then it looks like no PS2 BC going forward for anyone who buys the new 40GB model. However it is probably worth mentioning that PS1 BC is still fully functional in this model. Some consolation prize that though
posted by milan616 on 10/05/07
No, it isn't doable at 100% the speed of the PS2. Copy & pasted content I wrote in another thread on Battlefront.
I'm sure they could emulate the logic portions of the Graphics Synthesizer all day long, but they just don't have enough memory bandwidth anywhere outside of the caches (which are too small) to match that massive 48GB/s bandwidth that the EDRAM on the GS had. Even in a crazy (seriously, its insane) hypothetical situation where they were to somehow aggregate both the main and graphics memory buses, combined they wouldn't cut it, nor would there be enough left over for the rest of the PS2's emulation needs.
Oh and don't you worry, Microsoft will have the exact same problem on their hands if they don't include at least 10MB of EDRAM with 256GB/s bandwidth on their next console.
So if accurate, then it looks like no PS2 BC going forward for anyone who buys the new 40GB model. However it is probably worth mentioning that PS1 BC is still fully functional in this model. Some consolation prize that though