Asus Z87-A Pro adaptive voltage question

[Patiotools]

hey fellas. I've got a z87-a pro and a 4670K that is 6 hours AIDA64 stable at the following settings.

44x100
cpu cache multiplier 44
manual 1.25v
DDR3 1600 @ 1.5v.dimm

Temps max 83C average 76C

I want to convert this over to adaptive voltage to get the power savings advantages of haswell.. That said, in my BIOS i cant figure out how to set the ceiling! It says "Offset clock" and "additional turbo cpu voltage" which I can assume are additive to some sort of "Base voltage" That said I cant see where that base voltage is!

I set optimized defaults and restarted and the cpu voltage at boot is 1.008 so I set CPU offset at 0.001 and the additional turbo CPU voltage to 0.250 which i ASSUME 1.008 + 0.001 + 0.250 = 1.259v At that voltage I should be stable but I cant boot... So obviously there's some sort of user error involved...

Thanks for your help,
Patio

 

[Patiotools]

Any ideas fellas? I'm way to chicken to plug 1.25v into the "additional voltage for Turbo CPU" column. I'm afraid it'd take the base of ~1v and add 1.25v to it for 2.25V!

I suppose I'll go back to stock volts until someone clarifies this in a guide somewhere..

 

[=Wendy=]

I'm using the stock voltage + an adaptive offset of 0.020V, which gives me around 1.17V @4.4GHz, which my 4770k is stable at.

Take a look at this video when the Asus rep visited Anandtech, it explains the adaptive offset method.
http://www.anandtech.com/show/7063/overclocking-haswell-on-asus-8series-motherboards-video

 

[Patiotools]

I'm using the stock voltage + an adaptive offset of 0.020V, which gives me around 1.17V @4.4GHz, which my 4770k is stable at.

Take a look at this video when the Asus rep visited Anandtech, it explains the adaptive offset method.
http://www.anandtech.com/show/7063/overclocking-haswell-on-asus-8series-motherboards-video

Well.. in that case, something is off for me... with adaptive offset of .250 you would think the turbo volts would be 1.258 (base voltage 1.008) and I would be just as stable as my manual OC at 1.25v. Unfortunately I fail AIDA64 after 5 mins at that setting even though I stay under 83c. I can pass AIDA64 overnight at under 83c with manual volts at 1.25v

 

[coffeejunkee]

Forget trying to calculate required offset, there doesn't seem to be much logic to it. That said, it's definitely not based on your stock base voltage, but rather on what the auto setting would give at a specific clockspeed. (the higher the clock, the more vcore the auto setting gives). Just experiment a bit till you get your desired vcore under load.

Also, are you sure you're changing the correct voltage? Wendy uses +0.020 for 1.17 so you probably shouldn't be using +0.250. Or did you forget a zero?

 

[Patiotools]

I suppose I can experiment by using the stock multiplier, and slow bumping up by .005v adaptive turbo voltage until under load I hit the "~1.25v" or so. Then raise the multiplier back to 44.

 

[coffeejunkee]

That won't work because the auto vcore changes depending on the multiplier. Therefore an offset based on stock multiplier will be different than the offset needed for overclocked multiplier.

Just try the +0.020 Wendy is using. Use 44x multi, set cpu core voltage to adaptive, offset mode sign to + and cpu core voltage offset to 0.020. I don't think you need to change the additional turbo mode cpu core voltage, just leave it at auto. Then try if you can boot Windows. If not you'll need to increase the offset, if it does boot you can test for stability.