P8Z77-i underclocking question

Guest · Sep 13, 2013

I have an ASUS P8Z77-i M/B with an i5-3570k CPU.

Is it possible for me to adjust the M/B UEFI BIOS settings such that an underclock of 1.6 GHz can be achieved with i5-3570k? If so, how so?

rolli59 · Sep 13, 2013

Reduce CPU multiplier.

dwatterworth · Sep 13, 2013

Agreed with rolli59. Reduce CPU multiplier and you can reduce cpu voltages to reduce heat/power consumption.

Guest · Sep 13, 2013

rolli59 :

At the moment, the CPU ratio is set at 34. How do I modify this in UEFI BIOS once the turbo mode is turned off?

Previously, I could modify the CPU ratio in the ASUS AI Suite once I boot into windows under stock settings with the UEFI BIOS turbo mode turned on. However, I'd prefer not to do this every time I boot the computer.

Thanks for the prompt reply.

rolli59 · Sep 13, 2013

You should be able to save the setting in BIOS.

Guest · Sep 13, 2013

dwatterworth :

I am undervolting by 0.090V, with no issues in either Intel Burn Test or prime95. I am planning on moving the i5-3570k to a different rig (HTPC), and am hoping to turn down the frequency to conserve power / reduce heat.

I did run Intel Burn Test with 4 cores / 4 threads at 1.6 GHz (set in ASUS AI tool), and the power barely broke above 40W, and max temps hovered in lower 40C range. As mentioned in my previous response, I am hoping to set 1.6 GHz in the UEFI BIOS.

CORRECTION - At these settings, max power was 28.5W, and max temp was 48C. FWIW, this is in a stock SUGO SG05 case that is relatively cramped w/ EVGA GTX 670 FTW Sig 2, SSD, 3.5" HDD, slim DVD drive, and Thermalright AXP-100 cooler. My HTPC will be in a different case; I wanted to test the i5 watt / temp limits in this setup before moving it.

Thanks for your prompt reply.

rolli59 · Sep 13, 2013

In UEFI you will have to go in to advanced mode and use the Ai tweaker in manual mode. Chapter 3.4 in your manual.

dwatterworth · Sep 13, 2013

Very nice! I am hoping to do a similar rig for a nice home theater build. Investigating the e3 xeon variants vs the i5's. I'd give you the exact bios menus that you are looking for but I am at work and can't download the manual. If you don't get a reply by this evening I'll shoot one over.

Guest · Sep 13, 2013

Thank you rolli59 - I forgot to set AI tweaker to "manual". That did it.

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