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What in the world is CPU VDDA voltage?

post #1 of 11
Thread Starter 
I see this option in my bios, but I have no idea what it does. Can anyone shed some light on this?

Like, what it does, the best settings, dangerous settings, etc etc.
post #2 of 11
VDD-voltage. This means the voltage to Your nForce chipset. ( Northbridge )

But i think VDDA is something to do with AMD CPU's and Ram. do not know for sure.
Edited by nubz - 1/11/09 at 12:48pm
post #3 of 11
I know this thread kinda died but does anyone know what CPU VDDA voltage is ?

I have it on my M3N-HT and i dont know what it does. Im wondering if it helps with stability or something? im nearly at 3.3ghz on my 5200 and this might help

Thanks!
    
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post #4 of 11
Sorry to double post. Found out what it means!

Quote:
Originally Posted by Vegeta Rage View Post

VDDNB: makes volt flow to NB more stable. gentle with this one.
VDDA : makes volt flow to cpu more stable. 2.89 or 3.02 for overcloking is good.
BR voltage: is your chipset voltage. Carefull with this.
=]
    
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post #5 of 11
basically what happens to the voltage when a load is applied on the CPU is the voltage actually drops. so if you set your voltage to say 1.45v in BIOS and the CPU VDDA is set to it's lowest setting, under idle conditions, the voltage should be around 1.45v. however, under load, the voltage will actually drop below your setting of 1.45v. how much depends on the make and model of your motherboard.

setting the CPU VDDA to it's highest setting will cause the CPU voltage to be (alot) more than what you set it to in BIOS. for instance, if i set my CPU VDDA voltage to 2.80v (Auto, 2.5, 2.6, 2.7, and 2.8v are the settings on my ATI chipset), under idle conditions, my CPU voltage will be about 0.04-0.05v more than what i set it to in the BIOS. while under load, it can go as high as 0.10v over my BIOS settings.

it does this to make sure that your CPU is always getting a good amount of power so that the power doesn't dip down and cause BSOD's. usually setting it to AUTO is fine as it will use the lowest settings while under idle and use the highest settings while under load. this makes it so that your not wasting too much power and/or over-volting your chip at idle while making sure under load, you're receiving enough power.
    
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post #6 of 11
Can anyone confirm/deny pixies explanation? I am in a situation where amd overdrive is reporting my vcore at 1.45v idle, and 1.4v under load. I am 99% sure this is whats causing my bsod, but I just cant get my voltage to stabalize under load. I tried upping my cpu vdda to max (2.8) and it had ZERO effect (still dipped to 1.4v underload, still got bsod after 2min of prime95).

Help!
post #7 of 11
reminds me of a old piece of crap.


The Pentium with MMX is pin-compatible with the regular Pentium and goes in a Socket 7 just like the old chip. However, there is one important difference between the two: the Pentium with MMX uses split-rail voltage: 3.3 volts for the external voltage and 2.8 volts for the core. Not all motherboards with a socket 7 support this dual voltage setting, because before the Pentium with MMX came out no processors needed it, so some manufacturers skimped by not planning for the future. Intel is making OverDrives for motherboards that don't support the lower core voltage.
    
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post #8 of 11
Quote:
Originally Posted by Zeal View Post
Can anyone confirm/deny pixies explanation? I am in a situation where amd overdrive is reporting my vcore at 1.45v idle, and 1.4v under load. I am 99% sure this is whats causing my bsod, but I just cant get my voltage to stabalize under load. I tried upping my cpu vdda to max (2.8) and it had ZERO effect (still dipped to 1.4v underload, still got bsod after 2min of prime95).

Help!
Enable Load Line Calibration in your bios then open cpu-z and put load to your cpu and see how you core voltage responds now Zeal .
post #9 of 11
What settings do you use for load line calibration or does your only say disable or enable?
post #10 of 11
http://www.overclock.net/5533629-post5.html

see if thats got anything to do with it. i don know much about that so i cant comment.
    
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