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Voltages - What's what and what they mean - Page 3

post #21 of 54
yea thx a lot
post #22 of 54
Thread Starter 
No problem guys.

Do to the content of this thread; and some discussion. We (the AMD Editors) decided to move this sticky the AMD Motherboards Section as these voltage options are for all components controlled BY the Motherboard. Thus this would be the most appropriate section.
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post #23 of 54
I can't seem to find out the words for these acronyms, like what does VDDA spell out?
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post #24 of 54
Thread Starter 
Quote:
Originally Posted by sequencius View Post
I can't seem to find out the words for these acronyms, like what does VDDA spell out?
Your guess is as good as mine. No one at AMD has said what they actually mean.
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post #25 of 54
Quote:
Originally Posted by Tator Tot View Post
Your guess is as good as mine. No one at AMD has said what they actually mean.
lol amazing
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post #26 of 54
VDD stands for "drain voltage." The positive terminal on the transistors used in modern processors is called the drain terminal so VDD refers to the positive voltage powering those transistors.
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post #27 of 54
Quote:
Originally Posted by sequencius View Post
I can't seem to find out the words for these acronyms, like what does VDDA spell out?
Quote:
Originally Posted by Tator Tot View Post
Your guess is as good as mine. No one at AMD has said what they actually mean.

Couple of things here Tator... Forgive me for intruding on this subject... IIRC

1. VDD Stands for Voltage Drain Drain. BUT, Vdd is only a Positive (+) Supply Voltage for any Given IC of FET (Feild Effect Transistor) Circuits. Being that a Motherboards power supply to the CPU (and other areas) is "MOSFET" based or Metal Oxide Semiconductor Field Effect Transistor, the VDD Voltage only acts as a fine tuning terminal by the use of a "Drain" being that it is only a Positive Supply Terminal with Drain.

If one notices, when you set the CPU Voltage on a high end Motherboard and then change the CPU VDD Voltage, the adjustment of the VDD voltage, changes the CPU Voltage, but only by .025v at a time. This is why the VDD voltages are typically looked at as the "Offset" voltage and not the vCore voltage. Normal vCore votlage will (depending on the MFR and MoBo) have larger, less accurate changes in comparison.

I can leave the Vdd voltage on auto and change the Voltage of my CPU on my sig board and be stable. I may be using more voltage than I really need though. I could infact use the Vdd adjustment to increase or decrease the CPU voltage by .025v if needed. I typically don't use it though...

2. PLL Voltage (Phase Locked Loops) is actually used to created an alternate frequency "Loop" from the CPU's, to "Lock" onto the "Phases" (in and out) of the CPU's frequency to stablize the CPU's Frequency and to help prevent Spikes in the frequency itself, further stablizing an OC. Typically in higher frequencies... Spikes in CPU frequency are a common reason for Computer Lock ups or reboots. Either due to an unstable setting or EMI. This is why some board come with "Spread Spectrum" settings. Areas (Cities) with abnormal amounts of Electromagnetic Interference can cause system instability in electronics. Even other electronics can cause this effect. Unfortunately, there is no standard for adjustment of this voltage. It can only be executed properly through trial and error being that each CPU/ hardware combo is different. Even if Hardware is the same, Quality can vary in minor steps.

So I hope I didn't step on your toes at all Tator. I just wanted to add my 2 cents here. There was an oportunity to spread some knowledge and I took the chance. Thank you for posting this Definiton thread.

As usual...... You, are the man!
Edited by Mastiffman - 8/23/10 at 10:23pm
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post #28 of 54
Thread Starter 
Thanks Mastiffman; any info I can gather is MUCH APPRECIATED! And you get a nice appropriate rep (and addition to the OP) for that past.

I'm no electrical engineer, or anywhere close so I have to gather what knowledge I can from all parts of the world

Thanks again man. Those were excellent explanations.
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post #29 of 54
Lots of great info here, but is there any way you could include max safe and recommend voltages for every one?
 
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post #30 of 54
Thread Starter 
Quote:
Originally Posted by nagle3092 View Post
Lots of great info here, but is there any way you could include max safe and recommend voltages for every one?
That info is very subjective and can change with either stepping, revision, or CPU Type.
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