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| AMD's Quad FX Platform What's in a 4x4? | |
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(Author: MS, January 21, 2007) |
Power Consumption
Our initial power measurements in WindowsXP left us somewhat flabbergasted, even under idle conditions, the raw CPU power consumption was above anything we had ever seen. We used AMD's PowerMonitor to get a more detailed idea of what is going on - and our first impression was that the tool did not work either on the Quad FX platform. Well, it's not quite true, there are parts that don't really work, but otherwise the tool reports correctly as we later verified in Vista-64.
Windows XP-32
The power indicators don't work but the load and core frequency are shown somewhat correctly.
Note that under 0-load, the voltages and frequencies remain unchanged. As it turns out, there is a special CPU driver that is needed to enable C'nQ in WindowsXP-32. The latest published 1.3.2.16 CPU drivers install (seemingly) correctly but don't throttle the processor. Update: there was an error in the power management configuration that caused the glitch.
Windows Vista-64
A nice change for a change, the core frequencies drop to 1000 MHz, and the voltage is reduced to 1.1V. The same effect is achieved with the special CPU drivers in WinXP-32
next page: => Windows Idle Power =>
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