I think you need to show us a proof for this
The reviews I have seen shows that Atom Dual core was not far behind Zacate dual core in multi-threaded bechmarks
Ontario dual core has significantly lower clock speed than Zacate dual core (1.1Ghz vs 1.6GHz). So I think It is safe to say that Atom N550 Dual core is going to match or even beat Ontario dual core in CPU performance
EDIT: Also, you are wrong about the part were you said that TDP of Atom does not include GPU. Thats not true. Atom N4xx & Atom N5xx series, and Atom D series (like D525) has on-die GPU
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