ATI Adapters README file : XF86Config specifications : Clocks : Clocks for supported programmable clock generators
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## 5.2.1. Clocks for supported programmable clock generators

At bootup, video BIOS initialization programmes an initial set of frequencies. Two of these are reserved to allow the setting of modes that do not use a frequency from this initial set. One of these reserved slots is used by the BIOS mode set routine, the other by the particular driver used (e.g. MS-Windows, AutoCAD, X, etc.). The clock numbers reserved in this way are dependent on the particular clock generator used by the adapter.

The driver currently supports all programmable clock generators known to exist on Mach64 adapters. In this case, the driver will completely ignore any XF86Config clock specification, and programme the clock generator as needed by the modes used during the X session.

ATI Adapters README file : XF86Config specifications : Clocks : Clocks for supported programmable clock generators
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