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Undervolting E-350 Questions

post #1 of 7
Thread Starter 
I'm worried about undervolting my E-350 with brazostweaker; I have a few questions. I know that undervolting is beneficial but why do CPUs run at a higher voltage than they need? What is the minimum voltage I can set for an E-350? The default was 1.35V and I now set it to 1.225V and it seems to work. Is this change permanent?

Thanks!
post #2 of 7
Quote:
Originally Posted by HopeUTKN;14614234 
I'm worried about undervolting my E-350 with brazostweaker; I have a few questions. I know that undervolting is beneficial but why do CPUs run at a higher voltage than they need? What is the minimum voltage I can set for an E-350? The default was 1.35V and I now set it to 1.225V and it seems to work. Is this change permanent?

Thanks!

CPU companies don't have the time to perfectly bin every CPU. This is why CPUs are not sold at the highest possible clocks or the lowest possible voltages.

The minimum voltage is whatever your motherboard supports.

No, the voltage change is not permanent just like how an overclock is not permanent.

Undervolting is basically the same exact concept as overclocking. It is determining the extreme conditions where the chip will continue to operate stablely.
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post #3 of 7
Does this overclocking tool stay set,or does it return to stock clock/voltage when rebooting?
Edited by TronRR - 8/17/11 at 8:00am
    
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post #4 of 7
If you have the time for all the trial and error it's worth it.

I have an Athlon II 240 in an HTPC and I lowered the voltage from 1.4V to 1.125V at 2.8Ghz. And lowered the idle voltage from 1.125V to 0.775V. It's been running like that for two years now with no problems. And I like the lower temps and power consumption.
    
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post #5 of 7
Quote:
Originally Posted by John-117;14614568 
If you have the time for all the trial and error it's worth it.
Totally true.

I built a Ph x2 rig, and while OCing to 3.51 GHz (from 3.2 GHz stock) i lowered voltages from 1.4v to 1.325v. Been 3 months and it is still going rock stable.

Overclocking and undervolting is one of the greatest things along with sliced bread biggrin.gif

Not all CPU's are the same (if they were everyone would just share one OCing setting per processor) and manufacturers do clock them with the highest wattage they can while still in the TDP limits of said chip.

The undervolting setting will not stay forever, as you cannot "flash" a CPU (like you can do with a video card) but as long as you do it either with BIOS, or keep the software running at boot, the setting wil be applied.

I can advise you to follow the same proceedure as with OCing when undervolting: do stress testing. Booting into windows =/= stability.
Edited by Starbomba - 8/17/11 at 9:25am
   
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post #6 of 7
Hi all,

you can make the undervolting settings "permanent" by enabling the service, which takes care of applying the voltage changes on boot and wake-up events in the background. There is a wiki, which describes how to setup the service. WikiLink

Hope that helps,
witteks
post #7 of 7
Quote:
Originally Posted by HopeUTKN;14614234 
I'm worried about undervolting my E-350 with brazostweaker; I have a few questions. I know that undervolting is beneficial but why do CPUs run at a higher voltage than they need? What is the minimum voltage I can set for an E-350? The default was 1.35V and I now set it to 1.225V and it seems to work. Is this change permanent?

Thanks!

If you look at the E-350 specs, you'll see that the Max Operating Temp is 90C

when you undervolt, you're probably no longer stable if the cpu temp gets to 90C but the idea is that a temp that high shouldn't happen

like previous posters said, if you can't pass stability tests at a voltage setting then the voltage is too low. personally, I like 24 hours Prime95 blend, especially if the memory controller is on the CPU die
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