link
"Enhanced C1 (C1E) - [Enabled, Disabled] C1E functions to reduce the CPU multiplier to 6.0x when idling or running in load-load conditions. This can sometimes provide a small degree of power savings, especially if the system is highly overclocked to begin with. Most users find the constant switching between the idle and load frequencies annoying, besides which a small performance penalty is experienced during each transition. We usually disable this setting and recommend you do the same if you are building your system for gaming purposes."
"Enhanced Intel SpeedStep(tm) Tech. - [Enabled, Disabled] Although some BIOS releases may allows this features to be alternately Disabled or Enabled, it has no affect unless the installed CPU is capable of conducting power state transitions and no desktop chipset contains this feature set (yet). This option should be grayed out unless you have some special CPU have not encountered."
I think that they are wrong, as Intel clearly claims that EIST is supported on nearly every desktop C2D CPU that I've ever seen, and with it enabled, you can clearly see with CPU-Z the voltage changes.
Perhaps there is something unsupported with Nvidia chipsets, but it seems supported to me on P35 at least. My understanding is that the CPU itself conducts the power state transitions, not the system chipset. Thus it should be chipset-independent.
Plus, I recall seeing posted here an excerpt from the intel documentation describing how these power state transitions work. Why would intel document such a thing if it didn't exist.
In short, I think that this article is wrong.
"Enhanced C1 (C1E) - [Enabled, Disabled] C1E functions to reduce the CPU multiplier to 6.0x when idling or running in load-load conditions. This can sometimes provide a small degree of power savings, especially if the system is highly overclocked to begin with. Most users find the constant switching between the idle and load frequencies annoying, besides which a small performance penalty is experienced during each transition. We usually disable this setting and recommend you do the same if you are building your system for gaming purposes."
"Enhanced Intel SpeedStep(tm) Tech. - [Enabled, Disabled] Although some BIOS releases may allows this features to be alternately Disabled or Enabled, it has no affect unless the installed CPU is capable of conducting power state transitions and no desktop chipset contains this feature set (yet). This option should be grayed out unless you have some special CPU have not encountered."
I think that they are wrong, as Intel clearly claims that EIST is supported on nearly every desktop C2D CPU that I've ever seen, and with it enabled, you can clearly see with CPU-Z the voltage changes.
Perhaps there is something unsupported with Nvidia chipsets, but it seems supported to me on P35 at least. My understanding is that the CPU itself conducts the power state transitions, not the system chipset. Thus it should be chipset-independent.
Plus, I recall seeing posted here an excerpt from the intel documentation describing how these power state transitions work. Why would intel document such a thing if it didn't exist.
In short, I think that this article is wrong.