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I agree that if everything is equal, the difference between a 120Mhz and 133Mhz machine is negligible. I have just been surprised in the past (my 760CD with a 90MHz Pentium was slower than my 755CX with a 75MHz Pentium, and as I say, my Toshiba 133Mhz turned out to be much faster than I expected -- as you suggest, this may be due to the PCI bus -- I am assuming that the 760ED with 133MHz processor will be comparable to or faster than my Tecra, but I don't know about the 560. What would be useful is to build up a set of benchmark tests, perhaps using the PC Magazine test suite, which you can download. We could combine figures published by PC Magazine with individual tests done by people on this list. By the way, I have definitely seen a 133MHz 560, so they do exist!