Hardware Monitor
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Hardware Monitor is an application to read out all available hardware sensors in your G5. The program can display and visualize measured values in a large variety of fashions. It can also store and export readings. It can even display CPU pump speeds in the liquid-cooled models!
Includes the following sensor types:
• Battery sensors
• Voltage sensors
• Current (amperage) sensors
• Fan speed sensors
• Sensors for pulse-width controlled fans
• Power and load sensors
• CPU Pump sensors
Readings from my MacBook Pro

More screen shots >>
We highly recommend you try it out! It's a great diagnostic tool.
Note: You need to register it for all functions to work.[/url]