SPCR

Is there any driver or tool to download with C2D chips to disable/enable the throttling?

rei wrote:Is there any driver or tool to download with C2D chips to disable/enable the throttling?

EIST, Enhanced Intel SpeedStep needs no software in XP or Vista. you can enable or disable it in the BIOS of the motherboard.

It should be enabled/disabled in both the BIOS and Windows XP power management according to Bay Wolf's SpeedStep FAQ.

Thanks for the replies. So set to "minimum power management" profile a la CnQ?

More or less Yes, but cool 'n quiet saves more energy.

C&Q is better because it drops the voltage and multiplier more than EIST. The lowest multiplier for Core 2's is 6 so on the E6420 system I just built EIST drops the multiplier from 8 to 6 and vCore from 1.35V to 1.20V. Not really a lot of power savings there. I imagine it'd be more effective on Core 2's with high multipliers.

Amourek wrote:C&Q is better because it drops the voltage and multiplier more than EIST. The lowest multiplier for Core 2's is 6 so on the E6420 system I just built EIST drops the multiplier from 8 to 6 and vCore from 1.35V to 1.20V. Not really a lot of power savings there. I imagine it'd be more effective on Core 2's with high multipliers.

multiplier is only dropped to 5x on A64, but because it uses 200MHz CPU FSB only therefore final is only 1000MHz compared to 1600MHz Core2

Frequency is nearly irrelevant, only the vcore counts here. And that's 1.1 V for the Athlon 64 and 1.15 V for the desktop Core 2 Duo. How much the CPUs draw in idle is also determined by the manufacturing process. As an example, look at the Core 2 Duo which evolved pretty well as you can see here.