The Atom N280 and N450 both come in at 1.66GHz while the Atom N270 and Z530 are 1.6GHz. In all actuality, there really aren't performance differences between the Atom N280, N270, or N450 processors. The only one that is sluggish is the Z530. It was designed to be the most power efficient Atom line for MIDs (mobile internet devices). MIDs are much smaller than netbooks. However, some manufacturers (such as Dell) use the Atom Z520 and Z530 processors in their netbooks.
So I suggest not going with an Atom Z530 powered netbook. Even though it clocks in at 1.6GHz, its real world performance is less than the other Atom processors mentioned.
Now, the N270, N280, and N450 processors all perform the same. The extra 60MHz that the N280 and N450 processors have over the N270 doesn't translate to something that you would see in the real world. Additionally, all benchmarks that run tests and apply scores always rate the N270, N280, and N450 processors the same (or 1-2 numbers different).
The differences between the N270, N280, and N450 processors come in the amount of power that they use. The N280 is more power efficient than the N270 and the N450 is more power efficient than the N450. The only difference here is that the power efficiencies don't result in decreases in performance (unlike the Atom Z530).
So don't worry about it so long as a netbook has either the N270, N280, N450, or a newer N Atom processor (though the new ones also clock in at 1.66GHz, they are just more power efficient than the Atom N450). The performance will be the same and the increases in power efficiency don't really matter all that much given that Asus can get 10+ hours out of an N270 powered unit.
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