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1.2 GHz, 8GB Memory, 512GB SSD, 2015 model -
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2.5 GHz, 16GB Memory, 1TB SSD, 2015 model-
See also 13" MacBook deals
Mac Pro Westmere Performance with Handbrake Video Encoding
The 12-core is about 20% faster than the 6-core, because Handbrake uses only about 9 cores.
Beta build vs regular
The August 30, 2010 build is about 9% faster than the 0.94 release version.
These are the settings used for testing.