Quick OC question.

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adam mcleish

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Apr 2, 2013
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Hi all.
Long term reader, first time poster!

So I've just built a rig:
CPU i5 35670k
MB P8Z77 v lx
GPU gigabyte gtx 670 (once it returns from been rma)
Zalman 9plus
CM 212 evo.

So I've done a quick OC to 4.2 in BIOS (changing the multiplier for the turbo speed to 4.2 and changing the offset to -0.05 - which I've found is my lowest number for the voltage). Everything else I have left alone.

Now when I start up windows, I load real temp and cpu-z, and its immediately at 4.2 at ~2.5v. After a few minutes it drops down to 1.6 at 0.984v. When I start the prime95, it goes to 4.2 at 1.192v.

My question is, is it normal for it to start up at 2.50v?
 
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rex4235

rex4235

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Jun 9, 2012
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Check your BIOS' Load-Line Calibration (LLC) settings. The higher -- more extreme they are, the higher your MB is allowed to bump the voltage to prevent Vcore Drop/Droop. Turning it off completely will allow you MB to only utilize your set Vcore and offsets
 
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rex4235

rex4235

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Jun 9, 2012
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I have a similar setup (only an AMD platform) and I only have 3 options for LLC -- Auto, Enable, and Disable. Some MB's have a range of "aggressiveness". When I set to either enable/ auto, it spikes me to 1.44v. When I use disable, I just have to adjust the offset for the maximum desired voltage. I would recommend finding the LOWEST stable vcore for your desired overclock and run an offset based on that. This is what I did and it resulted in an AMD 965 @ 3.8 1.404 vcore @ 48*.

If your temps are within spec (not much of an Intel guy) then you can only go down (better) from there
 
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adam mcleish

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Apr 2, 2013
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Mine seems to be solid at ~1.18 for 4.2. I'm getting temps at around 56-58.
It's really weird. Like after 2 minutes, the processor idles at 1600mhz at 0.970.
1.25v* (typo on my last post) never comes back after that first 2 minutes of boot up.
My bored doesn't actually let me disable LLC, only to set it at regular which is 0%, but that didn't do anything.
 
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rex4235

rex4235

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Jun 9, 2012
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Under no-load conditions, your processor will step down to conserve power. This is normal. Only when needed will it run full speed. This may be why you are seeing it start up in the Windows environment at full speed/voltage, then drop, then raise again when running Prime.

Asus calls this "Cool'n Quiet"
 
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adam mcleish

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Apr 2, 2013
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No no, I understand that it slows down - that's what I want. It's the voltage thing that's confusing me.
1.25v on start up for 2 minutes.
0.980 on idle (1.6ghz)
~1.180 on prime95 (4.2ghz).

It never reaches 1.25 again (which is good), but I don't understand why it's 1.25 at the start up and not 1.180, which is the max voltage whilst its under full load in prime95.
 
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