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Better comparison, but again, not with the N270, uses the Z530, but still (N270 will do a bit better than the Z530):
They're results seem to indicate the Z530 fits between an 800Mhz and 1.2Ghz P-M. Since the N270 is slightly better than the Z530 on performance, I still feel pretty comfortable with the 1.4Ghz P-M compare. Regardless, just the fact that it gets close is enough IMHO.