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My E8400 is "underclocked" - Page 2

post #11 of 13
There's also another "function" that can lower your CPUs clock speed, C1E (i think it's called). Try disabling it too.
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post #12 of 13
Quote:
Originally Posted by mrtn400 View Post
There's also another "function" that can lower your CPUs clock speed, C1E (i think it's called). Try disabling it too.
That is Speedstep
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post #13 of 13
Quote:
Originally Posted by prosser13 View Post
That is Speedstep
Actually that is a popular misconception.

Source:
Quote:
C1E enhanced halt state — Introduced in the Pentium 4 500J-series processors, the C1E halt state replaces the old C1 halt state used on the Pentium 4 and most other x86 CPUs. The C1 halt state is invoked when the operating system's idle process issues a HLT command. (Windows does this constantly when not under a full load.) Entering halt state, which is a lower-power state, will cut a CPU's power consumption and heat production. Intel's new C1E halt state is also invoked by the HLT command, but it turns down the entire CPU's clock frequency (via multiplier control) and voltage in order to work its mojo. This more robust halt state requires significantly less power than the old C1 implementation.
C1E halt cranks the CPU bus multiplier down to its lowest possible level on the 600-series processors, which is 14X, so a P4 660 processor with the C1E halt state active actually runs at 2.8GHz. I believe that C1E halt is also a binary condition invoked by the HLT command; it's either on or it's off.


Enhanced SpeedStep — SpeedStep also modulates the CPU clock speed and voltage according to load, but it is invoked via another mechanism. The operating system must be aware of SpeedStep, as must the system BIOS, and then the OS can request frequency changes via ACPI. SpeedStep is more granular than C1E halt, because it offers multiple rungs up and down the ladder between the maximum and minimum CPU multiplier and voltage levels.
Intel cites its mobile products when talking about SpeedStep, which is apt but not entirely helpful because it conjures up images of the Pentium M processor, a very different beast. The Pentium 4 doesn't contain most of the heroic power-saving measures of the Pentium M.
I figured I would throw in TM2 also:
Quote:
TM2 thermal throttling — Since the beginning, all Pentium 4 processors have included a facility for throttling themselves back in the event that they should begin to overheat. This facility, called Thermal Monitoring 1 or TM1, essentially tells the Pentium 4 to take half its clock cycles off, cooling the CPU and reducing power by about 50%. Externally, the chip still runs at its rated frequency, but internally, it runs at half that. This throttling mechanism is effective, but it has several disadvantages. As Michael Schuette has noted, the rest of the system doesn't know what to do with an internally throttling Pentium 4, and the memory subsystem can be thrown into a retry loop that causes it to heat up. For the same reason, TM1 throttling can really harm performance.
TM2 throttling instead steps down CPU voltage and clock speed via the same mechanism as C1E and SpeedStep, effectively cooling the CPU by roughly 40% without affecting performance as severely TM1 throttling does. TM2 shouldn't throw the memory subsystem into a retry loop, either. Like TM1 throttling, TM2 becomes active when the CPU decides it's getting too hot.
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