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Mac Pro 5,1 A1289 2010 2.8GHz Quad-Core Xeon CPU Tray / Board w/. Mac Pro 5,1 A1289 CPU Tray. Model A1289 (EMC 2314-2). It also supports "Hyper-Threading" -- which "allows two threads to run simultaneously on each core" (so Mac OS X recognizes eight total cores on this model, four real and four virtual) -- and "Turbo Boost" -- which "automatically boosts the processor speed based on workload" (so if an application is only using one of the four cores it will automatically increase the speed of the core in use and turn off the unused cores), in this case up to 3.06 GHz.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.