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The newly refreshed Mac mini is seeing improved single-core performance over the previous models, but decreased multi-core performance, according to a newly released GeekBench benchmark



From MacRumors:
John Poole of Primate Labs says that the upper tier Late 2012 Mac minis, which had quad-core Ivy Bridge processors, saw better multi-core performance than the new Late 2014 models, which have dual-core Haswell processors. Unlike single-core performance multi-core performance has decreased significantly. The "Good" model (which has a dual-core processor in both lineups) is down 7%. The other models (which have a dual-core processor in the "Late 2014" lineup but a quad-core processor in the "Late 2012" lineup) is down from 70% to 80%.Poole notes that Apple may have switched to dual-core processors in some Late 2014 Mac minis because Haswell dual-core processors use one socket to connect the logic board and processor while Haswell quad-core processors use different sockets. This would mean Apple would have to design and build two separate logic boards specifically for the Mac mini, while other Macs use the same logic boards across its individual line.
  Late 2014 Mac Mini Benchmarks Indicate Decreased Multi-Core Performance