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Undervolting and Overclocking the i7 3770K: Success ?

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I been using 45-46 multiplier and a offset 0.005v for a week but yesterday I got a few errors yesterday while gaming at 60% load so I raised the offset to 0.010v
I am using using a 45-46 multiplier and a offset 0.010v on my asrock Z-77 extreme4 with a level 2 llc second highest
When I run ibt my vcore 1.254-1264.
Idle vcore .904-944+ volts
 
john3850 said:
I been using 45-46 multiplier and a offset 0.005v for a week but yesterday I got a few errors yesterday while gaming at 60% load so I raised the offset to 0.010v
I am using using a 45-46 multiplier and a offset 0.010v on my asrock Z-77 extreme4 with a level 2 llc second highest
When I run ibt my vcore 1.254-1264.
Idle vcore .904-944+ volts
Click to expand...

How about the temps ? and what cooler are you using
 
I only used it all day twice I find it takes me a while to switch from a older pc to a new one.
I am runnig a Swiftech Apogee r2,d5,360 rad 6 fans@120cfm if needed temps are 80+ in ibt.
Gaming and net 60% load temps stays in high 50s
I was worried about the summer heat but my case is very cool so it may be ok this summer.
 
Alright gents, I think I found my sweet spot:

settings and results: (mind the negative offset)

347fjnn.jpg


cpu-z: (on complete idle for 8 hours):

6svy95.jpg


realtemp (complete idle for 8 hours):

118n59l.jpg


As you noticed, one of the cores reached 40c on complete idle, any comments about that ?

I did the idle test because the offset was set to -0.115v which will make make the Vcore start at 0.7**v. I think that this voltage is relatively low and may cause BSOD, I guess I was wrong, no BSOD's or whatsoever, either during idle or on startup.

If you have any feedback,comments.suggestions, please let me know. I am eager to know some expert opinions about this OC settings.
 
4.2GHz @ -0.115 should be *EASILY* stable, since I can get 4.2GHz at -0.180 with a 3570K (0.712v idle, 1.104 peak voltage at load)... the 3770 *should* be even better.

Regarding 40C idle that's normal for an air-cooler... it's a temperature spike, your CPU probably went to 100% load for a second while it loaded something, and your cooler didn't have time to compensate... a 40C spike would even be normal on ambient liquid cooling.
 
Last edited:
Your cpu-z screenshot shows idle voltage but load clocks. Is your cpu not downclocking at idle?

Also, can you post the cpuz and realtemp screenshots at load?

The uneven temperatures between cores is normal, by the way, but load temps are the critical ones to look at.
 
I noticed that the cpu-z clocks are always at full load while real temp clocks aren't. I don't know which one is accurate.

Btw, you can find the results (both cpu-z and real temp) written in the first screenshot.
 
CPU-Z should be accurate for Hz, it's not terribly accurate for voltage though on this (Z77 Ext4) board... it can be as much as 0.02v off.
 
If it's not idling down, and SpeedStep/Turbo is enabled in the BIOS... check your Power Profile (In your OS), and make sure the minimum processor state isn't set to 100%
 
I set it to 50%, it is working on CPU-Z now, fluctuating and reaching miminal speeds, i.e. 1899.98 MHz

Thanks for the tip
 
go to the advanced settings for the power profile...

1. Change Plan Settings
2. Change Advanced Power Settings
3. Processor Power Management
4. Minimum Processor State ... 0%

Edit.. k nevermind...lol... 1600 is the minimum though...
 
Gpu-z does not always give you the correct cpu speed at idle.
When I use Intel Extreme Tuning Utility or RealTemp it will always show me my correct speed if C1E is on.
I have had pcs crash when going from a low multiplier voltages to full speed to correct this I raise the vcore or

shut off C1E.
 
So I found that the best thing is to go back to 42 multiplier with a -0.110v offest and a +0.004 tubro voltage, everything else is on default settings.

This offset lead to the same voltage as the stock one (1.128v~1.136v on full load and 0.7*~0.8* on idle) and everything is working fine.

I'll try to go higher once I get a better cooler.
Thanks for the help anyways.
 
Pardon me for digging up this old monster from the grave, I've been toying with undervolting myself for the summer months and I set my 3770K's OC down to 4.2GHz.

So far -0.080v with LLC level 2 on an ASRock Z77 Extreme4 is OK, I've had a couple games crash on me after 10-15 minutes, but Windows and programs don't seem to have a problem and IBT didn't hiccup once. I also played with -0.100v with LLC 1 but didn't put it to much test yet.

So any ideas? I'm trying to keep max temps as low as I can, I recently just picked up a Coolermaster Seidon 120V liquid loop.
 
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