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Undervolting/Editing P-States For Piledriver using AMD MrsTweaker (Mini Guide)

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post #11 of 28 (permalink) Old 07-02-2014, 02:08 PM - Thread Starter
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http://puu.sh/9U7eq/888d011024.png that's what I got initially on msrTweaker. And PScheck was missing the rows for P1 2 3 but I got em back now! http://puu.sh/9U7gS/86e05934d4.png

So I got my issue solved, actually. All I did in bios was turn core multiplier and fsb back to auto. (And turbo, cause stock settings. but I doubt that matters) (maybe my 240 fsb caused the other states to not get used, considering fsb impacts em all, so that's less potential complications)

Ah, glad you found it. Yes, unfortunately undervolting and overclocking don't go well together. You actually gave me the idea to edit and add that this guide is intended for non overclocked configuration.

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post #12 of 28 (permalink) Old 07-02-2014, 02:15 PM
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Ah, glad you found it. Yes, unfortunately undervolting and overclocking don't go well together. You actually gave me the idea to edit and add that this guide is intended for non overclocked configuration.

Hey the tool does offer customization for the full load and half load turbo, so those might actually see some more use with this c;

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post #13 of 28 (permalink) Old 07-02-2014, 02:24 PM - Thread Starter
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Hey the tool does offer customization for the full load and half load turbo, so those might actually see some more use with this c;

Well, the turbo applies when not all cores are fully loaded. However, you can edit the max P-state (non turbo), to an overclocked value. As long as you keep bus at "auto", MAYBE it could work. A benefit with the turbo values, is that you can undervolt those too. 1.42v is too high. Mine does 4Ghz at 1.34v. But i have turbo disabled.

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post #14 of 28 (permalink) Old 07-02-2014, 02:40 PM
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Well, the turbo applies when not all cores are fully loaded. However, you can edit the max P-state (non turbo), to an overclocked value. As long as you keep bus at "auto", MAYBE it could work. A benefit with the turbo values, is that you can undervolt those too. 1.42v is too high. Mine does 4Ghz at 1.34v. But i have turbo disabled.

P1(msrtweak)/Pb1(pscheck) is the full load turbo (the one that can kick in when all cores are working) which you can't adjust in bios, but I heard there's other software that can fiddle with it too. Also strangely all my states work now even though I went back to manual fsb. Maybe I broke something and fixed it by turning things off and on c;

But yeah I'll stay away from things I can't stresstest for now, my psu over current protection is a bit sensitive on the cpu rail (had this issue over 2 boards and cpus so pretty sure it's that and it's been consistent past certain voltage ever since I got it really, so I don't feel too pressed to replace it c;)

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post #15 of 28 (permalink) Old 07-02-2014, 03:04 PM - Thread Starter
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P1(msrtweak)/Pb1(pscheck) is the full load turbo (the one that can kick in when all cores are working) which you can't adjust in bios, but I heard there's other software that can fiddle with it too. Also strangely all my states work now even though I went back to manual fsb. Maybe I broke something and fixed it by turning things off and on c;

But yeah I'll stay away from things I can't stresstest for now, my psu over current protection is a bit sensitive on the cpu rail (had this issue over 2 boards and cpus so pretty sure it's that and it's been consistent past certain voltage ever since I got it really, so I don't feel too pressed to replace it c;)

The 3.8 turbo, works with all cores unparked, but i don't think with all cores fully loaded. The reasoning is this: as long as the TDP is below the limit, then all cores will remain active. BUT, if you stress test them all together, i don't think it will hold...It will probably fall to the previous (non turbo) state, because all cores at 100% is above TDP. i think... So how do you stress that for stability?

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post #16 of 28 (permalink) Old 07-02-2014, 03:24 PM
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The 3.8 turbo, works with all cores unparked, but i don't think with all cores fully loaded. The reasoning is this: as long as the TDP is below the limit, then all cores will remain active. BUT, if you stress test them all together, i don't think it will hold...It will probably fall to the previous (non turbo) state, because all cores at 100% is above TDP. i think... So how do you stress that for stability?

Well, you'd still have to test it in a regular state first. Or maybe selectively force different turbo/high level states through PScheck, it MIGHT be assumable to be stable with half the cores at your desired turbo and half the cores at max regular state clocking, applied to lower states for stress testing, repeat with cores swapped.
Quick test seems to indicate that PScheck applies mixed states nicely http://puu.sh/9Uesf/4315129ba9.png (both cores of a given module require the same clock though)
Of course it's hard to verify that the theory works c; Nice to have easy access to the full load turbo either way!

edit: also, I have turbo off now but I seem to remember it was possible to actually force turbo states with PScheck when I had turbo enabled. maybe 50% sure on that c;

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post #17 of 28 (permalink) Old 07-03-2014, 01:02 AM - Thread Starter
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Well, you'd still have to test it in a regular state first. Or maybe selectively force different turbo/high level states through PScheck, it MIGHT be assumable to be stable with half the cores at your desired turbo and half the cores at max regular state clocking, applied to lower states for stress testing, repeat with cores swapped.
Quick test seems to indicate that PScheck applies mixed states nicely http://puu.sh/9Uesf/4315129ba9.png (both cores of a given module require the same clock though)
Of course it's hard to verify that the theory works c; Nice to have easy access to the full load turbo either way!

edit: also, I have turbo off now but I seem to remember it was possible to actually force turbo states with PScheck when I had turbo enabled. maybe 50% sure on that c;

RIght. Besides, there is a workaround. You can just overclock for a while, stress test at 3.8, find the voltage and then go back and put it in the bat file.

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post #18 of 28 (permalink) Old 03-16-2015, 02:41 PM
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Thanks for the guide, I've been thinking about exactly this for a while now! thumb.gif
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post #19 of 28 (permalink) Old 03-16-2015, 02:44 PM - Thread Starter
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Thanks for the guide, I've been thinking about exactly this for a while now! thumb.gif

You 're welcome! We need more undervolters! biggrin.gif

EDIT: Since you dug out the thread, i took the opportunity to update the 1st post with a new indicative string of values for [email protected]

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post #20 of 28 (permalink) Old 03-21-2015, 12:20 PM
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Is this similar to the old PhenomMSRTweaker?

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