MacWorld has published the first benchmarks of the iMac Core 2 Duo, and has compared the new iMac model with previous ones and with a Mac Pro entry-level clocked at 2.66GHz.
Despite the fact the test is comparing computers that are not matching properly for reallyevaluating performance improvement linked to the CPU upgrade, one can conclude that the Core 2 Duo Merom is indeed at least 10% faster than the Core Duo Yonah; and for some tasks (video encoding) performance gain is close to 20%.
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