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Oddly it will be the E3200 but overclock the E6400 a bit and it will be better.
I can tell you from experience, i had an e3200, until i got my current e6400, trust me E6400 is so much faster.
2.13 GHz 2 MB 1066 MHz 65 nm Q3'06
2.4 GHz 1 MB 800 MHz 45 nm Q3'09
Comparing old and new with a 3 year gap when they were tested makes it hard so I just used this: