Adding pci express cards, About pci express cards – Apple Mac Pro (Early 2009) User Manual
Page 69
Chapter 3
Making a Good Thing Better
69
Adding PCI Express Cards
You can expand the capabilities of your Mac Pro by installing cards in the Peripheral
Component Interconnect (PCI) Express slots. Your Mac Pro has one double-wide PCI
Express graphics slot and three PCI Express expansion slots, for a total of four slots.
These slots accommodate PCI Express graphics cards and expansion cards.
About PCI Express Cards
Your Mac Pro comes with a high-performance PCI Express graphics card, which
contains the graphics processor unit (GPU) and provides the computer’s display ports.
The graphics card is installed in slot 1.
You can install additional PCI Express graphics and expansion cards. Before installing a
card, check its specifications to make sure it can operate in your Mac Pro:
 Slots 1 and 2 are x16, PCI Express 2.0 slots
 Slots 3 and 4 are x4, PCI Express 2.0 slots
All four slots support 16-lane cards.
Important:
Combined maximum power consumption for all four PCI Express slots must
not exceed 300 watts (W).