i5-2500k and Gigabyte GA-Z68XP-UD3P Best Overclocking Method

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Sonny73N

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Nov 30, 2011
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Hi all,

I've had this system overclocked to 42x since I first built it about 18 months ago but after a lot of readings regarding to this CPU overclocking, I think my method is not best. Could it be this Gigabyte mb sucks? Please give me some insight on this mater.

GA-Z68ZP-UD3P
i5-2500K OCed to 42x with everything in BIOS set to auto except for CPU Vcore set to Normal (idle @0.9v load @1.30v in CPUZ). Temp on load about 76C (IntelBurn), idle about 30C
Zalman CNPS9500 AT HSF
G-Skill 8GB (4GBx2) 1333MHz Cas 7
Corsair HX850 PSU
Kingston HyperX SSD 120GB
Evga GTX 560ti
Windows 7 Ultimate 64bit

I read some people use offset voltage but this MB doesn't have offset(?), it has Dynamic Vcore instead. This DVID affects both idle and load voltage. Say CPU clocked to 40x (where I first intended), it doesn't need all 1.30v, if -0.04v applied in DVID, idle voltage will drop to 0.86v which will cause system to crash on idle but temp is about 5C lower under load.

This MB with everything on auto in BIOS, in Advance Voltage Settings, CPU Vcore shows 1.34v. In M.I.T, it shows 1.32v and in CPU-Z, it shows 1.30v on full load. I'm confused.

Thank you all for your time. Any suggestion, advice, input is welcomed. Thanks in advance.
 
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bebop460

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I'd trust the CPU-Z voltage readings.

Sounds to me like "DVID" is the same thing as offset voltage. From what I've seen, the offset config does effect both idle and load voltage. LLC (load line calibration) will also effect your voltage. This is an excellent guide on configuring offset and llc: http://www.overclock.net/t/968053/official-the-sandy-stable-club-guides-voltages-temps-bios-templates-inc-spreadsheet/2240#post_14466483 . I preferred to tinker until I was happy with the results, but his formulaic approach might be helpful to you.

Some people like using offset, others don't like the voltage fluctuation, favoring manual voltage instead. So that's another possible option for you. It didn't work for me, requiring +0.04v more to run stable compared to offset or auto.

A lot of people have had bad luck with auto voltage. On my system, auto is identical to the best offset config., so if you don't want to tinker with offset voltage and llc, you might want to see what kind of results you get with auto voltage. No matter what you decide, I think you can probably do better than 1.3v needed for 4.2.

If it helps, I'd add that my 2600k at 4.2ghz has pretty much everything set to auto. The only change I made was to put the turbo to manual/250. It runs at 0.944-0.952v at idle and 1.248-1.272v, 1.256v average at 100% load.





 
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Sonny73N

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Thanks bebop460 for your reply

Also thanks for the link, that's one of the best guides I've read and probably 100's of others over the past 18 months.

I have come to a conclusion that I will never buy another Gigabyte MB because my i5 could do 44x on default voltage with a cheaper ($110) Asrock z68 board which I had before this one ($189 + tax).

Quote
"If it helps, I'd add that my 2600k at 4.2ghz has pretty much everything set to auto. The only change I made was to put the turbo to manual/250. It runs at 0.944-0.952v at idle and 1.248-1.272v, 1.256v average at 100% load."

Change turbo to manual/250 on what? BTW what board do you have?


 
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bebop460

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You're welcome, happy to help.

I've read about quite a few people on overclock.net that have had poor results with Gigabyte boards. It's surprising, as their boards seem to have good features/warranty.

You got 4.4ghz on stock voltage? Impressive. I have an ASRock Z68 Extreme4. Seems like the info must have gotten cut out of my profile last time I edited it.

Surprisingly, pretty much auto everything gave me equal results to offset voltage. The only adjustment I made was to the turbo current limit per the guide I linked to above: I set the turbo to manual, with short/long/core current limits at 250. Without increasing the current limit, the CPU wouldnt exceed 3.5ghz for more than a fraction of a second.

PS: To clarify the different voltage readings you are getting, from what I understand, the motherboard reading, and VID readings that some software provides is not what is actually being used by the CPU. Actual vcore being used is indicated in CPU-Z.
 
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