User Guide

Mac Pro (8x) Troubleshooting — General Information 134
DIMMs for Mac Pro (8x) must t these specications:
667 MHz, FB-DIMMs•
72-bit wide, 240-pin modules•
36 devices maximum per DIMM•
Error-correcting code (ECC)•
Important: For proper operation of Mac Pro (8x) computers, Apple recommends using only
Apple-approved Mac Pro (8x) FB-DIMMs. Refer to GSX for Apple FB-DIMMs service part numbers.
PCI Express Cards
The Mac Pro (8x) logic board includes one double-wide PCI Express graphics slot and three
PCI Express expansion slots, for a total of four slots. The computer comes with a graphics card
installed in slot 1. You can install additional PCI Express graphics and expansion cards in the
remaining three PCI Express expansion slots.
Important: Combined maximum power consumption for all four PCI Express slots must not
exceed 300 W.
Slot 1: Double-wide
PCI Express graphics
(graphics card installed)
Slots 2–4: PCI Express
Internal Cabling Matrix
The table on the next page lists all Mac Pro (8x) internal cables that connect to the logic board
and are not part of a larger subassembly. Following the table is a map of the logic board
connector locations, which are listed in column 5 of the table.