For the ordinary user technology EIST (Enhanced Intel SpeedStep Technology) allows to lower the processor frequency up to any minimal value, reducing the power requirement level , during idle time .
Processors of family Core 2 Duo E6xxx support EIST technology , the minimal multiplier is equal 6x, that allows models of 1066 MHz bus to work on frequency of 1.6 GHz during the idle time. The power requirement level in such condition will not exceed 22 w. Preparing the announcement of the fourth quarter processor Core 2 Duo E4200 with frequency of 1.6 GHz and 800 MHz bus.the processor in this economic mode will work at frequency of 1.2 GHz.
However, overclocker for a long time are trying to switch off such technologies In their opinion, work with such technologies leads to worst overclocking capability
to get rid from EIST , owners of processors Conroe stepening B0 and B1 step-by-step instructions are given. So, utilities CPU-Z will be necessary for operation and CrystalCPUID ( MSR Editor of section Function of the main menu) for us.

1. To the field "MSR" write 0x000001A0.
2. press button " RDMSR " for data read-out.
3. copy the top"high" 32 bit register EDX in the bottom field for data input (value should be equal 0x00000060 or something similar).
4. copy the bottom"low" 32 bit register EAX in the bottom field for data input (value should be equal 0x63940089 or something similar).
5. replace figure " 3 " on "1" in led round red positions (the result should look like 0x61940089 or similar).
6. press button " WRMSR " for data recording.

The processor multiplier now should accept the maximal value (in this case 10x), it will not decrease within the limits of EIST work .
Let's notice, that editing MSR registers can turn back with unpredictable results, therefore manipulations you will make all at own risk. Most likely, the option of switching-off EIST will appear in BIOS of many motherboard with Conroe support , and necessity of similar manipulations will disappear. Actually, function EIST brings more advantage, than harm