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Hopefully these resources can help out.


Quote:


Originally Posted by [email protected]




Quote:


Originally Posted by [email protected]

We have talked about previously that BCLK maximizing also maximizes the RAM frequency, and all Sandybridge CPUs support up to DDRIII-2133 DRAM Ratio when been used with P67 chipset regardless if it is a K or not. (A 21.33 x BCLK Ram speed in other words) Other ratios including the 1866 (18.66xBCLK), 1600 (16xBCLK), 1333 (13.33x BCLK) and lower are also available for your pick when needed.

Therefore if you have a set of RAM that can only do 2000MHz and not more, you will have to adjust your BCLK / DRAM Ratio to try to hit as close to this sweet spot as possible. In this case, either 107.2 BCLK with 1866 DRAM Ratio OR 93.7 BCLK with 2133 DRAM Ratio are both ideal choices. For some who may feel disgusted with under-clocking their PCIE (though real world performance difference can be questionable) let us just focus on 107.2 for this example if the CPU boots with this BCLK, considering the BCLK limit DEPENDS 90% on CPU and 10% on the motherboard.

Back on with our walkthrough, now keep the Vcore that you have set previously (Probably 1.40v to 1.50v region), and try to lower the CPU Turbo Ratio to 36x and try to raise the BCLK to a bootable state that is not to surpass the ability of your RAM. You can try going by 0.2MHz steps to speed things up (Yes, you are right, most P67 based motherboards allow BCLK adjustments of 0.1MHz in each step).

Once you have found your Max BCLK, you can now go back and find your MAX CPU Speed by going with 48X and increasing BCLK till it crashes. In this case you should expect to reach something like 4850MHz! This is then the best performance you can squeeze out of your CPU that you should try to target. Finally, set your configuration to the configuration best suit the top performance you have found a minute ago, i.e. 45 X 107.2MHz with 1866 DRAM Ratio (i.e. [email protected])

Source(s): http://forum.lowyat.net/topic/1705375 | http://www.xtremesystems.org/forums/...d.php?t=264300
 

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