Apple’s new Mac Pro has been available in a standard desktop tower configuration since December, but starting today, Apple is selling its promised rack model that’s designed to be mounted in server rack setups — starting at $6,499, an extra $500 .

From a specification perspective, the new rack Mac Pro is virtually identically to the tower model. Apple offers the same configuration options at the same prices (down to the included mouse and keyboard, which are unusual to see for rack-mounted hardware) with three main differences.

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