Specifications

Power Mac G5 Troubleshooting - 3
General Information
*The PCI slots can accommodate mixed-voltage (5.0 V, 12 V, or 3.3 V) cards but only at
3.3 V signaling, with 32-bit or 64-bit data widths and a 33 MHz frequency. You can add a
66 MHz card to a 33 MHz PCI slot if the card can operate at the lower 33 MHz rate.
Warning: Installing PCI cards that function only at 66 MHz could damage the computer.
However, cards that run at both 66 MHz and 33 MHz may be installed. Check with the
card’s manufacturer to see if a 66 MHz card also works at 33 MHz.
Thermal Calibration
To ensure proper fan and temperature control in the Power Mac G5, you must run Apple
Service Diagnostic whenever you replace a processor or logic board with a new processor
or logic board. You must also run the diagnostic if you re-install the same processor but in
a different connector from the one in which it was originally installed. Apple Service
Diagnostic for Power Mac G5 is available as a download from the Disc Images section of
the Apple Service Source website.
Note: The calibration process of Apple Service Diagnostic requires a controlled
environment to ensure accurate ambient temperature readings. Computers under test
must have the transparent air deflector installed and the door sensor switch must be
operable. Units under test should also be located away from heating and air conditioning
ventilation systems and the fan exhaust of other machines. Ambient temperature should
not go above 77 degrees Fahrenheit or 25 degrees Centigrade.