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CPU offset undervolt! NEW CPU!

post #1 of 5
Thread Starter 
Hello everybody, I'm new here and I have some questions, wink.gif

Two days ago I've build a new system, which going to serve as a file server/nas. The hardware I used is:

cpu: Intel g1610 2.6GHZ
ram: crucial 4gb 1600mhz 1.5v cl 9
mbo: asrock h77m
psu: 300watt be quiet
case: elite 310


Since it's going to be used as a nas, it's going to be running alot wink.gif. So I wanted it to be as efficient as possible. I've looked in the bios and set the CPU voltage offset to -0.160. The result was it didn't boot. Than I tried -0.130 and it booted, yay!

If I understand it right, a CPU has different speedsteps. For example, when the system is idling, it gets a multiplier let's say 12 => result: the cpu runs at 1200mhz. If you load it a bit more it gets a multiplier of 16 => result 1600mhz. Every speed step has a specific voltage. And by setting a negative cpu voltage offset, the new voltage at every speed step is determined by the old voltage minus the offset.


I was wondering if it is safe to set my cpu voltage offset to -0.130, like I did? I did run two blend tests with prime95 under linux. One test of 5 hours and another of 16-17 hours. But I understand that prime95 only test's load voltage, so maybe the cpu is instable when it's idling or @ 50% load. I was wondering if I can say, that my undervolt is stable or not? Is it safe to use an offset of -0.130? Since it's going to be the hearth of my NAS, and the files on there are very important to me, I don't want it to crash wink.gif. Should I run other tests? that change the multiplier, tot test all the different speed steps? Or is it safe to say, if the load voltage works, the idle voltage is also fine?





Thanks in advance

(srry for bad english)
I tried to highlight the important things, so it's more readable, Hope somebody can help me biggrin.gif

edit: I'm running currently linux to run tests on the hardware wink.gif
post #2 of 5
Start by making sure the LLC is turned off. Because I think it is enabled by default on Asrock motherboards.

If you have LLC on and you have negative offset the result is that you are most likely running at stock voltage under load but without load the LLC won't increase your voltage so you are correct that it may cause instability at lower clock speeds or when there is not a lot of load.

One thing you can do to test a smaller load is to run only 1 process on prime95. Windows will keep switching the process across cores so they will all get a small work out.

But start with making sure that LLC is off.
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post #3 of 5
Thread Starter 
Okay first of all ty for your post wink.gif it was very helpfull wink.gif; I fact I have two systems with this chip, one home theater pc and one server. The HTPC uses the asrock b75 pro3-m motherboard, but I can't find the turn off LLC function on that board. Maybe it is named something else?

My second motherboard is the asrock h77m, I found the LLC option and set it to 0% (it was on auto). I left the offset at -0.130volt. I'm running a prime stress test right now, 2 threads blend test (i'm using linux, ubuntu).

I'm not 100% sure what you mean with:

"One thing you can do to test a smaller load is to run only 1 process on prime95. Windows will keep switching the process across cores so they will all get a small work out."
Do you mean, I should run only one thread? (instead of 2)



So now to go back to the HTPC without the LLC function. Should I disable the cpu offset, since I can't find the LLC disable option?
Also I have to note, the lowest cpu offset I can set on this board is -100mV, This is what i've set it to. all seems stable, but again, I can't find the LLc function. So what should I do now?





But really, THANK YOU ( + rep wink.gif )
Edited by bosiwow - 2/18/13 at 8:58am
post #4 of 5
Quote:
Originally Posted by bosiwow View Post

Okay first of all ty for your post wink.gif it was very helpfull wink.gif; I fact I have two systems with this chip, one home theater pc and one server. The HTPC uses the asrock b75 pro3-m motherboard, but I can't find the turn off LLC function on that board. Maybe it is named something else?

My second motherboard is the asrock h77m, I found the LLC option and set it to 0% (it was on auto). I left the offset at -0.130volt. I'm running a prime stress test right now, 2 threads blend test (i'm using linux, ubuntu).

I'm not 100% sure what you mean with:

"One thing you can do to test a smaller load is to run only 1 process on prime95. Windows will keep switching the process across cores so they will all get a small work out."
Do you mean, I should run only one thread? (instead of 2)



So now to go back to the HTPC without the LLC function. Should I disable the cpu offset, since I can't find the LLC disable option?
Also I have to note, the lowest cpu offset I can set on this board is -100mV, This is what i've set it to. all seems stable, but again, I can't find the LLc function. So what should I do now?





But really, THANK YOU ( + rep wink.gif )

It might not have LLC. Also yes that is what I meant about the processes. Run just 1 process and then if there is LLC it won't add as much voltage. This will allow you to test it a little bit. The thing is though just using the computer normally if it restarts or bsods then you know why.
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post #5 of 5
Thread Starter 
ty, gonna try to run a 1 thread test for a few hours wink.gif , are there stress tests that stress every single speedstep?
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