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Explain adaptive voltage to me!

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Supreme [H]ardness
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Nov 17, 2000
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I get the idea of how it works but when I enable it I am not sure what to put in each of the fields to ensure I get the 1.255V manual it takes to get my chip stable at 4.5ghz.
 
how did you test for stability?

if that 1.255v is linx/avx or prime95/avx stable, then start with an adaptive voltage of 1.205. stress test some more and adjust the voltage depending on stability.
 
Aida64 for stress testing. I saw two settings I can change when I enable that option.. offset and now i forget the other.
 
voltage offset increases or decreases the voltage by a fixed amount over the cpu's entire speed range. the other number sets the target voltage only for when the cpu is operating past its highest specified turbo frequency (i.e. overclocked).

for example, my i5-4670k has a max turbo of 3.8ghz, and a minimum speed of 800mhz. i've measured the default voltages to be ~0.70v at 800mhz, scaling up to 1.175v at 3.8ghz. overclocked speeds (speeds higher than 3.8ghz) stay at 1.175v.

if i set that second voltage value (not the offset) of adaptive voltage to 1.250v, the cpu will run at standard voltages at non-overclocked speeds, but will run at 1.250v instead of 1.175v when going past 3.8ghz. under certain situations (like executing avx instructions, as with prime95/avx and aida64 testing), the cpu will go even higher on voltage. i've measured 1.3v when stress testing with prime95/avx with the adaptive voltage specified at 1.250, but when stress testing with an older version of prime95 that doesn't use avx, the voltage never goes past 1.25v.

so bear in mind that adaptive voltage does not set a hard upper limit on voltage, unlike setting a manual fixed voltage.

the offset value simply increases or decreases voltage by the specified amount across the cpu's entire range of speeds (including overclocked).

so with my cpu if i set an offset of +0.020v and don't specify the second value, then it will run at 0.72v at 800mhz scaling up to 1.195v at 3.8ghz and staying at 1.195v past 3.8.

if i set an offset of +0.020v and an oc voltage of 1.250, my cpu will run at 0.72v at 800mhz scaling up to 1.195v at 3.8ghz, and then run at 1.270v once past 3.8ghz. but the cpu will probably pull 1.32v or even more if i stress test with the latest version of prime95 or aida64.

so in your case, set the offset to 0 and the oc voltage to 1.205v as a starting point. increase or decrease the oc voltage as necessary depending on stress test results.

i don't really see a need to play with the offset unless you want to undervolt your cpu at stock speeds. if your cpu can run stably at stock speeds with, say, .030 less volts, then set the offset to -.030 and increase the oc voltage by .030 so that it will still get the same voltage when overclocked.
 
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