Processor 35ghz 6 core intel xeon e5 with 12mb l3 cache and turbo boost up to 39ghz configurable to 30ghz 8 core processor with 25mb l3 cache or 27ghz 12 core processor with 30mb l3 cache memory 16gb four 4gb of 1866mhz ddr3 ecc memory configurable to 32gb four 8gb or 64gb four 16gb hard drive 256gb pcie based flash storage configurable to 512gb or 1tb optical drive none software operating system os x mavericks airdrop airplay dictation gatekeeper notification center facebook