Multichannel audio through Mini DisplayPort. Analog stereo line-level input and output minijacks. Optical digital audio input and output TOSLINK ports. Front-panel headphone minijack and internal speaker. Five USB 2.0 ports (two on front panel, three on back panel). Four FireWire 800 ports (two on front panel, two on back panel). Hyper-Threading technology for up to 8 virtual cores. Turbo Boost dynamic performance up to 3.06GHz. 8MB of fully shared 元 cache per processor. One 2.8GHz Quad-Core Intel Xeon W3530 “Nehalem” processor. 
Hyper-Threading technology for up to 16 virtual cores.
Turbo Boost dynamic performance up to 2.66GHz.12MB of fully shared 元 cache per processor.Two 2.4GHz Quad-Core Intel Xeon E5620 “Westmere” processors.
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