I'm going to carefully come back in here with a couple of serious (meaning, not intended to start a flamewar) questions pertaining to RSX (Panajev, Faf, I'm looking at you):
50MHz cannot be that big of a deal. Like previously mentioned, overclock your GPU by 50MHz and then tell me if you get a significant or even considerable performance boost. You really don't. And that's on a PC with x86 architecture. PS3 is completely different and made for power in games... I cannot see how 50MHz is seriously going to hinder on the performance of RSX.
I've been out of the PS3 hardware loop, not even close to being interested like I was for PS2, because there's so much more to follow and it goes over my head. But I am slowly starting to become interested again. It seems like RSX, to begin with, was downgraded. Is this true? Or was it always at 550MHz?
Also, what's this about Xenos having more features? Panajev, you say "so what"... I'm assuming this implies you can still use RSX to do the same things if you take the time to instruct it to do so (whereas Xenos already knows how without being programmed to)?
Plus, isn't it a bit unrealistic to compare the RSX with high end nVidia PC GPU's? It's being used in a completely different architecture.