CPU display frequency does not match the actual frequency

Failure phenomenon:

We often have user calls in the wiring to reflect the frequency of the CPU is very low, (for example, core 6300 running at 1.6G, Flash dragon 3200+ operating frequency only 900Mhz), the user suspected of hardware failure or the CPU when the factory installed another model. In fact, this is the AMD energy-saving technology: "CNQ" and the Intel CPU energy-saving technology "EIST" at work. Here are 2 manufacturers of different energy-saving technology to do an explanation.

Workaround:

One. Intel CPU Energy-saving technology: "EIST"

1. Introduction

EiST is known as "enhanced Intel SpeedStep Technology" and is a power-saving technology developed by Intel Corporation specifically for mobile platforms and server platform processors. The technology is also built into the new desktop processor, which is supported by the Pentium 4 6xx series, Pentium D, and core full range processors with frequencies above 2.8G in Intel CPU products. It can automatically adjust the processor voltage and frequency according to the different system workload, in order to reduce the power consumption and calorific value, and this adjustment process is completely automatic, without manual intervention.

2. How to turn off the "EIST" feature

EiST on and off is controlled by the BIOS settings in the motherboard. For example, Acer Desktop M460: Enter the bios-advanced BIOS Features option to locate Intel EST (the default is enabled), and close to disable

Note: Why is the CPU frequency measured by software not a nominal integer?

The frequency of the motherboard is realized by the crystal oscillator circuit on the motherboard, some of the boards have independent crystal oscillator, some are integrated in the circuit, The crystal oscillator generates a frequency of 14.318KHZ, the motherboard circuit through its multiplication finally obtains the 133-333mhz unequal front bus frequency, at this time produces the error already many, the Intel or the AMD CPU all multiplies the front bus frequency through the frequency multiplication technology again, finally obtains our in the system visible CPU actual operation frequency. Because the front has always been the error, the actual operating frequency and the operation frequency of the callout is a few trillion gap is very normal.

Two. AMD CPU Energy-saving technology: "CNQ"

1. Introduction:

The cool and static technology of AMD (cold and Quiet), CNQ, is a technology that allows the CPU to automatically adjust the frequency and voltage according to the system load by using the Athlon64 series processor. The technique works by controlling the frequency and voltage of the CPU when it is idle or running a low load program, so that the CPU power loss, heat reduced, and can be adjusted according to the temperature of the fan speed, due to the lower temperature and the fan speed also reduced, so as to reduce noise and reduce energy consumption role.

2. Cool and static technology requires 5 aspects to support, respectively:

A. AMD 64-bit processors that support this technology

B. Enter the motherboard BIOS at power-on and turn on the CNQ option

C. Operating system to Windows XP SP1 above

D. Install the CPU driver. Note: To be separated from the dual-core patch area; Vista systems do not need to be installed.

E. System settings, select least power management in the Power management power scheme in Control Panel.

3. How to turn off this feature

If the above five-point installation requirements do not meet the first, then the function is automatically turned off.