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Power Macintosh G5 Q&A - Updated April 2, 2009

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Which Power Macintosh G5 models have PCI, PCI-X, and PCI Express slots? How many PCI slots of what speed does each Power Macintosh G5 have? How do you install a PCI card?

The main Power Macintosh G5 specs page on EveryMac.com provides "PCI" or "PCI-X" in parenthesis after the name of systems to indicate which systems have PCI or PCI-X slots at a glance. The Dual Core and "Quad Core" systems have PCI Express slots.

The details regarding the number, speed, and configuration of PCI slots provided by each PCI and PCI-X equipped Power Macintosh G5 model are provided below. Each of these systems also has an 8X AGP Pro slot that "supports up to 2-GBps data throughput" and is occupied by the graphics card in the default configurations.

System Name

PCI or PCI-X Slots

Power Macintosh G5 1.6 (PCI)

Three open full-length 33 MHz, 64-bit PCI slots.

Power Macintosh G5 1.8 (PCI-X)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

Power Macintosh G5 2.0 DP (PCI-X)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

Power Macintosh G5 1.8 DP (PCI-X)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

Power Macintosh G5 1.8 DP (PCI)

Three open full-length 33 MHz, 64-bit PCI slots.

Power Macintosh G5 2.0 DP (PCI-X 2)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

Power Macintosh G5 2.5 DP (PCI-X)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

Power Macintosh G5 1.8 (PCI)

Three open full-length 33 MHz, 64-bit PCI slots.

Power Macintosh G5 2.0 DP (PCI)

Three open full-length 33 MHz, 64-bit PCI slots.

Power Macintosh G5 2.3 DP (PCI-X)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

Power Macintosh G5 2.7 DP (PCI-X)

Three open full-length PCI-X slots: one 133 MHz, 64-bit slot and two 100 MHz, 64-bit slots.

These systems have three available PCI Express slots (two four-lane and one eight-lane). An additional 16-lane PCI Express slot is occupied by the graphics card in the default configurations.

System Name

PCI Express Slots

Power Macintosh G5 Dual Core (2.0)

Two open full-length four-lane PCI Express slots, and one open full-length eight-lane PCI Express slot.

Power Macintosh G5 Dual Core (2.3)

Two open full-length four-lane PCI Express slots, and one open full-length eight-lane PCI Express slot.

Power Macintosh G5 "Quad Core" (2.5)

Two open full-length four-lane PCI Express slots, and one open full-length eight-lane PCI Express slot.

To install a PCI, PCI-X, or PCIe card in compatible Power Macintosh G5 models, site sponsor Other World Computing has provided a helpful step-by-step video of the process:

In addition to upgrade videos, as you would expect, Other World Computing has all kinds of upgrades for the Power Macintosh G5, including PCI cards, memory, hard drives, and more.


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