Apple Mac Pro Computer - Manual (Page 69)

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Specifications
Processor and Memory Specifications
Processor
 Two dual-core or two quad-core Intel Xeon processors
 4 megabytes (MB) of on-chip L2 cache per dual-core processor
 8 MB of on-chip L2 cache per quad-core processor
 1333 MHz dual independent frontside buses
Random-access memory (RAM)
 Fully buffered Dual Inline Memory Modules (FB-DIMMs)
 PC2-5300, 667 MHz FB-DIMMs
 DIMMs must be installed in pairs of equal size and equal specification (an equal
number of devices per DIMM)
 Eight DIMM slots available (four slots per memory card)
 Error-correcting code (ECC)
 72-bit wide, 240-pin modules
 36 memory devices maximum per DIMM
 Contain an Apple-approved heat sink (for best acoustic performance)
 Conform to JEDEC specification (see page 32)
 Maximum height of 31 mm