Overclocking an i5 750

Hey everybody,

I got a new memory kit (Corsair Vengeance 2 x 4gb DDR3 1600mhz 1.5v), and wanted to take it to its full potential on my system.

CPU: Intel Core i5 750
MOBO: Gigabyte H55M-UD2H
CPU Heat sink: Cooler Master Hyper 212+ with arctic silver 5 thermal compound.

Before my memory upgrade, i had a 4gb kit of ddr3 at 1066mhz. In previous overclocking attempts, with turbo boost and power saving features enabled, I was able to get a BLCK of 147 on a multiplier of 21 (with a max turbo of 24). This leads to a base of 3.1ghz and turbo boost of up to 3.5ghz. Unfortunately, my memory multiplier max is 10x the front side bus, so with this setting I have a max memory frequency of 1470mhz. Now my mobo has an XMP profile, but when I enable this it bumps the BLCK to 160 (to achieve the 1600 mhz frequency), and drops the multiplier to 17, so a clock of 2.7ghz.

However, once I pass 147 BLCK, the processor runs constantly at a multiplier of 20, and idles around 30C. (With the 147 BLCK the processor idles at 13C with a 9x multiplier and has load temps of 42C). I guess my question is why do turbo boost and power saving features turn off as soon as I go past 147 BLCK? Is there some BIOS setting to change or a BLCK multiplier combo so that I can raise the BLCK and still have the processor dial down the speeds on idle?


Thanks for your help!