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Lesson 04 - Finding your motherboard's maximum stable reference clock speed


Before we start overclocking the CPU, we first need to find out how far we can push the ref clk.  The reference clock doesn't contribute to performance itself but it can be used to fine tune the frequency of the CPU and the other components making sure we get the maximum performance they are capable of.  If you have a non Black Edition CPU, where the multipliers are locked and can not be increased beyond their stock setting, you will be using the ref clock to do all of your overclocking.

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Overclocking the Reference Clock

Begin by raising the ref clk to 275MHz.  This value is probably greater than most motherboards can actually handle and more than you will need.  When we did that the CPU, HT Link, CPU NB and memory speeds went way up.  We're going to turn down the multipliers so the frequency of each component is at or below their stock setting.  So for this CPU it needs to be below 3200MHz, the RAM below 1600MHz and the HT Link and CPU NB below 2000MHz. Now all of the other settings are at or below their stock settings so the only component we will be stressing is the reference clock.

The system probably won't boot with the ref clk set to 275MHz.  250MHz is more realistic.  Just about every motherboard can handle 250MHz so it is safe. I'll hit F10 and yes to save and exit.  The system restarted and is going into Windows.  Once in Windows we'll start up Prime95 and use the Blend setting to stress the system.  With Prime95 running you need to look for these icons turning red and an error message inside the windows or if the system, freezes or blue screens and reboots you have gone too far. Let Prime95 run for about 15 minutes. If the system is stable, reboot, go into the BIOS To watch all of our complete video lessons with full written instructions you will need to purchase a login for the site. Buy Now..

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