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Help needed with P9X79, Turbo Settings. 3930k throttling.

post #1 of 9
Thread Starter 
My 3930k keeps throttling down to 3.2GHz when under high load and it is not a thermal issue.

There some turbo settings in the bios that might be causing the issue.

Long Duration Power Limit -> [Auto]

"The default setting of this item will be TDP (130W). For Sandy Bridge-E, Turbo Ratio can be kept a time duration exceed TDP for maximum performance. Any value under 255 can be programed. Use the <+> and <-> keys to adjust the value."

Long Duration Maintained -> [Auto]

"This value can vary from 1 to 32, which indicates the time window for Turbo Ratio over TDP should be maintained. Use the <+> and <-> keys to adjust the value."

Short Duration Limit -> [Auto]

"This is the second power limit to provide rapid protection when package power exceeds Power Limit 1. Default setting is 1.25 times the Power Limit 1. For Intel recommend, platform must be capable of supporting over Power Limit 2 for up to 10 msec. ASUS board can support over Power Limit 2 for long duration. Use the <+> and <-> keys to adjust the value."

Additional Turbo Voltage -> [Auto]

"This item allows user to set maximum additional voltage applies to the CPU when Turbo Boost is engaged. Use the <+> and <-> keys to adjust the value."

CPU Core Current Limit -> [Auto]

"This item allows user to enter CPU Current Limit, unit in 0.125A. Use the <+> and <-> keys to adjust the value." eh-smiley.gif


With default settings @ 4.6GHz 1.35v while idle it sits @ 1.6GHz and under load it goes to 4.6GHz but if the load last long enough it throttles down to 3.2GHz than back to 4.6GHz a second or 2 later...

So I went back into the bios and changed them to

Long Duration Power Limit -> [230]
Long Duration Maintained -> [32]
Short Duration Limit -> [250]
Additional Turbo Voltage -> [Auto]
CPU Core Current Limit -> [Auto]

That made it even worse.. tongue.gif Now you almost never even see 4.6GHz it goes right from idle to 3.2GHz sometimes you'll see 4.6GHz for a second but that is about it.


A other thing is why [Auto] for everything it would be nice if I knew the real default values for the stuff. I mean "CPU Core Current Limit -> [Auto] This item allows user to enter CPU Current Limit, unit in 0.125A. Use the <+> and <-> keys to adjust the value." so what is the default value?? Pressing + or - from "Auto" takes you to the min or max of the field not the value next to whatever "Auto" really is headscratch.gif

Asus could of also did better with the descriptions. confusedsmiley.png
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post #2 of 9
new issue or has always been this way? did you disable speed step?
and what are you using to "load" it
Edited by struddles - 8/6/12 at 2:00am
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by struddles View Post

new issue or has always been this way? did you disable speed step?
and what are you using to "load" it

New build and it's always been this way. At 4.4GHz it only does it under extreme loads while stress testing and not very often. At 4.5GHz it throttles a bit more often than at 4.4GHz and at 4.6GHz it throttles a lot.

Also speed step is enabled because I want it to idle @ 1.6GHz and lower vcore.

I use Prime 95 v277 to stress test it. Max I have seen it pull in HWMonitor was 213w, and core temps in the low 70s
Edited by V3DT - 8/6/12 at 2:10am
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post #4 of 9
well based on that evidence i would say the problem gets worse as power demand increases. bad psu? tbh i didn't touch any of the above mentioned settings when i over clocked. i do have a different board but it has those settings so i don't believe that would be affecting it. the only time i have noticed something similar with mine was when thermal was an issue but you said it wasn't so therefor something tells me your cpu is starved for power. you're probably drawing over 200 watts at that oc...
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by struddles View Post

well based on that evidence i would say the problem gets worse as power demand increases. bad psu? tbh i didn't touch any of the above mentioned settings when i over clocked. i do have a different board but it has those settings so i don't believe that would be affecting it. the only time i have noticed something similar with mine was when thermal was an issue but you said it wasn't so therefor something tells me your cpu is starved for power. you're probably drawing over 200 watts at that oc...
PSU is fine, 12v line on this PSU is rock solid.

And like I said when I changed the turbo settings it made the throttling happen with very little load.

Also using bios version 2002
Edited by V3DT - 8/6/12 at 2:21am
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post #6 of 9
then i haven't done much more than bump your thread several times. sorry, i hope someone with more knowledge responds
* just to be clear, when i say bad psu i don't mean the model is bad but the particular one you own might be*
Edited by struddles - 8/6/12 at 2:24am
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by struddles View Post

* just to be clear, when i say bad psu i don't mean the model is bad but the particular one you own might be*

I know... The voltages are reading fine... The PSU is fine.

What was your max OC and how did you stress test it?

P95V277 is newer and has AVX support. It stresses the CPU a bit more than the older versions.

update:

I reset the Turbo Mode Parameters all back to [Auto] because everything I was trying with them was only making things worse tongue.gif
After that I went and turned down the LLC from High to Medium than upped the vcore to get the same 1.35v under load I was getting with LLC high.

Then I booted from the windows install disc and opened CMD and ran CPU-Z, HWMonitor and Prime95.

CPU-Z showed 4.6GHz @ 1.352v and it stayed like that. biggrin.gif
Well it stayed like that for about 15 minutes and then had a BSOD 0x00000101 meaning the vcore is to low thinking.gif

So I bet 1.36v or 1.37v would get 4.6GHz stable.
4.5GHz is looking solid @ 1.35v though.

I think I might just stay at 4.4GHz @ 1.31v

Anyways it seems LLC High was causing the throttling but I am not sure why... Unless LLC high makes the VRMs heat up more even with a lower vcore, than maybe they where overheating doh.gif With the IR thermometer the max reading I got was 78C by the VRM area.


Nope that is not it tongue.gif happened again. Might have to do with CPU Socket Temp...
Edited by V3DT - 8/6/12 at 11:05am
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post #8 of 9
i have been as high as 5.0 but my chip needed way too much voltage. 4.8 was where i liked it but i backed it down to 4.6 to keep my temps in the low 60's. i use the newest version of prime and folding at home
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post #9 of 9
mine is doing the same, tryin to get 4.6 out of my 3930k which is under water. Core V is at 1.42 and temps dont go about 70 but the cpu throttles back down to 3.2ghz when using prime95 v27.7 frown.gif
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