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Apple Dual 1.8 / 2.0 G5 PCI incompatible with Delta Series PCI cards
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Depending on the specific Apple G5 model you own, your computer may be equipped with PCI, PCI-X (introduced in August 2003) or PCI-Express (introduced in October 2005) expansion slots.  Intel Mac Pro and late model DualCore PowerMac G5 owners click here.

Please note that PCI-Express uses an entirely different form factor than PCI or PCI-X. Existing PCI/PCI-X cards cannot be used or upgraded for use in PCI-Express expansion slots. This includes M-Audio's Delta and Revolution series of products.

Click here for more information on PCI/PCI-X vs. PCI-Express.

Furthermore, two specific PCI-equipped Apple G5 models have been found to be incompatible with some PCI audio interfaces, including M-Audio Delta cards:

- DUAL G5 1.8 GHz system with 4 RAM slots
- DUAL G5 2.0 GHz system with 4 RAM slots

The slightly older version of the Dual G5 1.8 GHz as well as the previous version of the Dual 2.0 GHz, which Apple advertises as “PCI-X” and not “PCI,” and which are also different from the newer model in that they have eight RAM slots instead of only four, ARE compatible and work perfectly well with M-Audio Delta Series PCI card. Please verify if you have one of these models before purchasing a PCI audio card.

Single Processor G5’s as well as Dual Processor G5’s with PCI-X and 8 RAM slots are NOT affected and work perfectly fine with M-Audio’s Delta Series of products.

M-Audio has worked closely with Apple to determine the source of this problem and it has been found to be the interaction of the host PCI controller (Apple's part named "K2") and the Delta PCI card.

The incompatibility manifests itself as noise in the signal, sample dropouts, and possibly no audio output at all.