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Strange voltage problems

post #1 of 13
Thread Starter 
So to start off this system has been at the same settings for the longest time with no problems.

Today I started up Prime95 to test temps because summer just rolled along (90F today)

Temps were all good, but I noticed my voltage which is set a 1.35 was at 1.28 when I was running prime95 not 10 seconds later I received a BSOD with the error code 124. (Also when I am not running prime95 and just a CPU intensive program like minecraft my Vcore is sitting around 1.31 and jumps to 1.34)

So I messed with some things and ended up setting my Vcore back to auto to see where that left me off at and low and behold when I booted up my Vcore was at 1.46V which is pretty high considering I should be able to hold 3.6 Ghz at 1.35v.

But my major problem is whenever I set the Vcore or not it will not give my CPU enough juice it just stays around 1.28V even though I have it set to 1.35V in the bios.

Any help would be appreciated thanks.
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post #2 of 13
Thread Starter 
I am thinking this is due to a problem with Vdroop and that I will need to increase my Vcore to compensate for this.

Any thoughts on this?

EDIT:But one question still remains why I am experiencing this now when I didn't before.
Edited by Bobicon - 4/10/11 at 11:11pm
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post #3 of 13
you're right, sounds like vdroop. is it turned ON?
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post #4 of 13
more than likely vdroop. bump ur voltage a little bit and run prime again and see where your voltage sits.
post #5 of 13
Quote:
Originally Posted by Bobicon;13080692 
I am thinking this is due to a problem with Vdroop and that I will need to increase my Vcore to compensate for this.

Any thoughts on this?

EDIT:But one question still remains why I am experiencing this now when I didn't before.

Yes, the Vdrop is the problem. You need to bump up your CPU voltage a little bit, like 1.3625V.
Before, you were stable because of the lower ambient/cpu temps.
Usually, "winter-time stable overclocks" are not stable during the summer:)
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by IOSEFINI;13080812 
Yes, the Vdrop is the problem. You need to bump up your CPU voltage a little bit, like 1.3625V.
Before, you were stable because of the lower ambient/cpu temps.
Usually, "winter-time stable overclocks" are not stable during the summer:)

Even though my current temps during the summer is not a problem?


Also I had my LLC set on Auto which was 56.1% (I don't have enable disable, but I set it to 12.6% and it stays around 1.325-1.36 volts underload now.

I may set it back to auto and bump the voltage first to see if that fixes it.
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post #7 of 13
Quote:
Originally Posted by Bobicon;13080842 
Even though my current temps during the summer is not a problem?


Also I had my LLC set on Auto which was 56.1% (I don't have enable disable, but I set it to 12.6% and it stays around 1.325-1.36 volts underload now.

I may set it back to auto and bump the voltage first to see if that fixes it.

yes, if during the winter your CPU temp was lower than now
Lower CPU temp(better cooling; lower ambient temp.) --> less CPU voltage
LLC use to fix that Vdrop. is good that your mobo has it
Leave it(LLC) at 12%
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by IOSEFINI;13080917 
yes, if during the winter your CPU temp was lower than now
Lower CPU temp(better cooling; lower ambient temp.) --> less CPU voltage
LLC use to fix that Vdrop. is good that your mobo has it
Leave it(LLC) at 12%

What is the downside to setting my LLC at 12%?
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post #9 of 13
Quote:
Originally Posted by Bobicon;13080972 
What is the downside to setting my LLC at 12%?

LLC "helps" your Voltage Regulators to keep the CPU voltage stable during IDLE/LOAD.
I run it Enabled. Always. Otherwise, I have to set my CPU voltage at a higher value

EDIT: in my case, with LLC enabled, my CPU volt goes higher than I set it in BIOS. I think, if you set your LLC at 0%(or 100%) , same thing will happen to you too.
In this case, you may be stable at 1.30V(set in BIOS)
Edited by IOSEFINI - 4/10/11 at 11:54pm
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post #10 of 13
Thread Starter 
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/26327-asus-m4a785td-v-evo-m4a785td-m-evo-am3-motherboards-review-18.html

I gave that a quick read their magic number for % was 19 so basically this states that
to low of a percentage yields high Vdroop and to high of a % yields a big voltage spike.

I guess I will have to do more testing tomorrow as it is getting pretty late, but thanks for the help.
Edited by Bobicon - 4/11/11 at 12:15am
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