![]() Set QPI ratio as close as possible to 6400.Increase CPU base frequency (we ended up at 160 MHz).Set maximum processor multiplier (25 for the 660/661 on the ECS H57H-MUS).So we were able to overclock the Core i5 661 processor to 4 GHz on an air cooler (!). Just play around with CPU voltage and even on the stock air cooler you can achieve some pretty snazzy results. The processor we used today is multiplier locked, meaning you select the highest possible multiplier and then increase the base clock in the BIOS or Windows tweaking software that comes along with your motherboard. Of course, if you have an Extreme Edition processor, things would be much easier as they have unlocked multipliers unfortunately this is not the case with the processor we use today. ![]() In the BIOS you'll find a 133 MHz register, labeled the base clock - look at that as your 'FSB' to play around with. ![]() It's a little weird but the concept remains the same. Ever since we met the Nehalem family of processors the Front Side Bus was officially annihilated, things tend to change a little in the overclocking department.
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