Before you install memory, determine whether you have a single- or dual-processor Mac Pro. Remove the side panel, following the instructions in “Opening Your Mac Pro” on page 39, and look inside:

ÂÂ A quad-core or 6-core Mac Pro has one processor and four memory slots. You can install a total of up to 16 GB of memory. See “Installing Memory in a Quad-Core or 6-Core Mac Pro” on page 45.

ÂÂ An 8-core or 12-core Mac Pro has two processors and eight memory slots. You can install a total of up to 32 GB of memory. See “Installing Memory in an 8Core or 12Core Mac Pro” on page 54.

One processor

Two processors

44Chapter 3   Making a Good Thing Better

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Apple MC561LL/A, MD772LL/A, MD770LL/A, MC560LL/A manual One processor