I have a question about overclocking an Intel Core i7-3770K CPU with an ASUS Maximus V Formula motherboard.
I notice that when Ai Overclock Tuner is set to Auto in the BIOS, my CPU frequency will drop during idle to about 1.6 GHz (100.3 MHz BCLK x 16X multiplier). When needed, the turbo will kick in and go up to 3.9GHz. Pretty standard for stock settings I guess.
Now, I want to be able to have this functionality when I manually assign turbo settings. For example, if I set Ai Overclock Tuner to Manual, and adjust the multipliers manually to 4.2 GHz (or even the standard turbo value of 3.9GHz - basically anything other than Auto), I will get the 4.2GHz overclock - but the CPU will never decrease its multiplier to 16X under idle conditions. It constantly stays at my overclocked settings.
Basically, I want to be able to let my CPU drop down to its low idle frequency when its not in use, but to a higher overclocked frequency when needed. Is this possible? If so, how can I do it?
Okay - so I figured out the issue. The ratio synchronization must be turned off to allow the CPU to throttle down. I don't really know why, but if the ratio is synchronized across all 4 cores, the CPU fixes its speed at the maximum multiplier you set.
If you individually set the multiplier though, it will happily throttle down to 1.6GHz under idle conditions - and turbo up to whatever you set.
I have this same set up and am able to accomplish this @4.6 .... Even with watercooling i find anything higher then 4.7 not worth the added temps for 100Mhrz or 200.
In the bios enable the
EPU Power Saving Mode
and EPU Setting to Auto
Also you may need to look in CPU Power Managment and enable
Enhanced Intel SpeedStep Technology
And finally in win 7 power managment (link in screensaver window)
you can also adjust how much it throttles the cpu at idle,sleep.hibernate, etc.
I am no pro, but this works for me, and hopes it helps you.
Couple other thoughts,
I do not use the ASUS Cpu Lvl up utility or the XMP, as they turn off many of these options and way over volt'd cpu.