• PCI or PCI-X should not be confused with PCI Express (also known as PCIe). PCIe is not compatible with PCI or PCI-X because PCIe uses a completely different connector. The UAD-1 will ONLY work in PCI and PCI-X slots, and the UAD-1e and UAD-2 will ONLY work in PCIe slots.
  
  
• The most recent G5 systems have PCIe expansion slots, but most have PCI-X slots. Please see our PCIe support page for centralized support information on our PCIe products

• The UAD-1 works with all G5 systems that have either PCI or PCI-X (but not PCIe) slots.
  
  
• The UAD-1e and UAD-2 works with the most recent G5 systems that have PCIe (but not PCI or PCI-X) slots.
  
  
• The best performance with the UAD-1 is obtained with G5 systems that DO NOT use the AMD-8131 PCI controller chipset.
  
  
• The best G5 model for UAD-1 performance which we have tested and recommend is part number M9747LL/A, Power Mac G5 Dual 2GHz, with three PCI (not PCI-X) slots.
  
  
• The most recent G5 system without PCIe slots is part number M9749LL/A, Power Mac G5 Dual 2.7GHz, with three PCI-X (not PCIe slots).
  
  
• G5 systems that use the AMD-8131 PCI-X controller will likely get lower plug-in instance counts than those shown in the instance count charts.
  
  
• Deep sleep is not currently supported on G5 systems that do not have the AMD 8131 PCI-X controller chipset. We are looking into resolving the issue. On these computers, set the Sleep mode to "Never" in the System Preferences>Energy Saver>Options panel.
  
  
• For additional G5 information, please review the following Support Report articles in the UA Webzine:
  
  G5 Article - UA Webzine - Support Report - March 2005
  G5 Article - UA Webzine - Support Report - May 2005
  G5 Article - UA Webzine - Plug-In Power - August 2005
  

• For improved performance on systems with two PCI busses when using a PCI-based audio I/O interface, install the UAD-1 and audio card on separate PCI busses. On dual-PCI bus systems, slots 2 and 3 are on one bus and slot 4 (furthest from AGP slot) is on a different bus.
  
  Note: The following G5 models have only one PCI bus:
  
  1.6GHz (M9020LL/A, August 2003)
  1.8GHz (M9555LL/A, October 2004)
  Dual 1.8GHz (M9454LL/A, June 2004)
  Dual 2.0GHz (M9747LL/A, April 2005)
  
  
• At high UAD DSP loads, inserting an additional UAD plugin can cause a very high host CPU load and/or audio dropouts. The point at which this occurs can vary depending on the total number of UAD plugins that are running. Additionally, some audio I/O interfaces may not allow UAD CPU loads as high as those when using only built-in audio.
  
  
• Firewire and USB audio interfaces may not perform as well as PCI-based audio interfaces. High host loads and/or low UAD DSP loads may result.
  
  Power Mac G5 models without the AMD-8131 PCI-X controller chip will not properly awake from sleep if the UAD card is installed but the UAD driver is either not installed or manually unloaded.
  
  Workaround: Leave the UAD drivers loaded and/or don't put the computer to sleep.
  
  
• For optimum performance, set the G5 Processor mode to "Highest" in the System Preferences>Energy Saver>Options panel.
  
  
• AMD-8131 Mode is automatically enabled as needed on G5 systems. If you use the UAD-1 in a PCI expansion chassis connected to a G5 system, AMD-8131 mode should be disabled in the UAD Meter Configuration window. See Chapter 3 of the user manual for more information.
  

Does the UAD-1 work with the Apple Power Mac G5?
Yes. The UAD-1 works with all Power Mac G5 models with either PCI or PCI-X slots (NOT PCIe or the iMac G5). However, due to Apple motherboard design differences, some Power Mac G5 models perform better with the UAD-1 than others. Please read our detailed articles on Power Mac G5 compatibility (links above) to understand how to best optimize the UAD-1 for use with specific Power Mac G5 models, and UA's recommended G5 models for the best UAD-1 performance:

Does the UAD-1 work with PCI-X?
Yes. The UAD-1 PCI card will function in PCI-X slots, since PCI-X is design to be backwards compatible with PCI universal signaling cards supporting 3.3v & 5v. The UAD-1 will run in its normal 32-bit PCI 33Mhz mode and will pull the PCI-X bus to this speed for all cards on the same bus. Therefore, on machines that support multiple PCI or PCI-X busses, it is recommended to use the faster bus for audio cards or cards that specifically support higher speed modes and the slower bus for the UAD-1. Additional detailed information about PCI-X is available here.

Does the UAD-1 work with latest G5's which have PCI Express (PCIe) and no PCI or PCI-X slots?
No, but the UAD-1e and UAD-2 do.

Which Power Mac G5 models are best for the UAD-1?
The UAD-1 performs best with G5 models that DO NOT use the AMD-8131 PCI controller chipset. The best recent model for optimum UAD-1 performance is the newer Dual 2GHz G5 with 3 PCI slots (Model M9747LL/A). The prior Dual 1.8GHz G5 with 3 PCI slots (Model M9454LLA) is also an excellent performer.

Is there any way to use my existing UAD-1's with a PCIe computer?
Possibly. Please visit our PCIe information page for the latest information about PCIe systems and compatibility.