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EMC2 · 03-08-2002, 07:54 PM

The PCR file is simply a "definition file" that allows Wcpredit to show you what the bits in the registers mean and what type the chip you are looking at is (for example, identify the chip as an AMD760 NorthBridge). They have no functional purpose as regards the operation of the program.

Enabling ACPI in the BIOS alone won't get things going. Setting the proper bits in the Northbridge only enables the power savings feature (which is what reduces the idle temp). To actually "trigger it", there are registers in the Southbridge involved. This is usually done by one of two things, either the OS itself (if IT has ACPI installed and enabled and understands you chipset) or by a CPU "cooler" program.

For example, in the KT266x chipset, setting the proper bits in the NorthBridge ENABLES the power savings feature of the STOP/GNT cycles. However, to trigger the cycles, a register must be read in the SouthBridge. The BIOS code is not where this triggering occurs. Again, the triggering mechanism is done by either the OS or a "cpu cooler" program (either CPUCool that I gave you the link to or VCool are ones I know work properly with your chipset).

If you really want to see, just download CPUCool for a quick "what does it do to my IDLE temps if the power saving feature is turned on and triggered".

03-08-2002, 07:54 PM	#4
EMC2 Cooling Savant Join Date: Feb 2002 Location: Dark Side of the Moon Posts: 365	The PCR file is simply a "definition file" that allows Wcpredit to show you what the bits in the registers mean and what type the chip you are looking at is (for example, identify the chip as an AMD760 NorthBridge). They have no functional purpose as regards the operation of the program. Enabling ACPI in the BIOS alone won't get things going. Setting the proper bits in the Northbridge only enables the power savings feature (which is what reduces the idle temp). To actually "trigger it", there are registers in the Southbridge involved. This is usually done by one of two things, either the OS itself (if IT has ACPI installed and enabled and understands you chipset) or by a CPU "cooler" program. For example, in the KT266x chipset, setting the proper bits in the NorthBridge ENABLES the power savings feature of the STOP/GNT cycles. However, to trigger the cycles, a register must be read in the SouthBridge. The BIOS code is not where this triggering occurs. Again, the triggering mechanism is done by either the OS or a "cpu cooler" program (either CPUCool that I gave you the link to or VCool are ones I know work properly with your chipset). If you really want to see, just download CPUCool for a quick "what does it do to my IDLE temps if the power saving feature is turned on and triggered".