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M4A89GTD-Pro/USB3 Voltage Questions

post #1 of 5
Thread Starter 
I am finally getting around to tweaking other voltages on my board and I am having problems finding out what the suggested voltages are. I would really like to know what those are!

I manually type each voltage in. I believe some of the voltages can be lowered, and I was seeking some opinions.

Here is the clocks I boot at and the voltages associated with them.

CPU: X4 B55 4.2GHz using 21x200
NB: 2800MHz
MEM: Low timings, but stock clock speed. 1600MHz

CPU Voltage: 1.4125v
CPU/NB Voltage: 1.20v
CPU VDDA Voltage: 2.5v (This one puzzles me. I am using high multipliers. If I increase this, could it reduce the amount of vcore I would need at higher multipliers? Specifically, over 21x200 I really have to push the vcore much higher)
DRAM Voltage: 1.65v (I cannot go any lower at these timings, my stability suffers)
HT Voltage: 1.20v (2000MHz)
NB Voltage: 1.30v (I still need to see if lower voltage is stable)
NB 1.8v Voltage: 1.8v (I am lost here on when to increase this voltage. I know I may be able to decrease it and lower NB temps)
SB Voltage: 1.2v
Side Port Memory Voltage: 1.5v (Dissabled and iGPU HD4290 Dissabled)

I would like to associate each of these voltages with an overclocking action. The ones in red are the ones I have problems with. What action would result in needing to increase these voltages?

Should I use less multiplier and more FSB? If I go up to 400x10.5, I can keep things simple and set my NB, DRAM, and HT to what they are at now by reducing their multipliers as well. Make that 300FSB, 400 would not boot.
Edited by BWG - 5/24/11 at 3:20pm
 
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post #2 of 5
NB 1.8v Voltage is the NB chip voltage.
Example
890FX is the NB chip. Which controls the PCI-E lanes.

I'm don't sure that the CPU VDDA Voltage is or does.
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post #3 of 5
Thoses two are both stock, and i would just leave them- unless you just want to play,as far as the cpu vdd on my sig rig i have lowered it too 2.2 and it runs stable, i also have that same mobo on my second rig with a 955be-love it great board.
    
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post #4 of 5
CPU VDDA is explain here http://www.overclock.net/amd-motherb...they-mean.html be sure and read through the thread as it comes up a few times.
 
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by The Sandman View Post
CPU VDDA is explain here http://www.overclock.net/amd-motherb...they-mean.html be sure and read through the thread as it comes up a few times.
I read that before I posted, hence I mentioned multipliers. I do not understand it though. I just reduced it down to 2.2v like the other poster did. I am going to run stability tests now. I do not understand when I would need to increase it. I guess a better question would be, "What does increasing this voltage help stabolize and how would I know when to increase it?"

I am going to try and go lower now that I am using 300 FSB. To be completely honest, these changes have already started making a great impact on my temps and I bet I can go to 4.5GHz once I get everything tight.

Quote:
Originally Posted by dixson01974 View Post
NB 1.8v Voltage is the NB chip voltage.
Example
890FX is the NB chip. Which controls the PCI-E lanes.

I'm don't sure that the CPU VDDA Voltage is or does.
When would you increase this voltage and is it safe to decrease it? I run my GPU x16 and at sig clocks. Could decreasing this voltage potentially make my GPU fail? Is that the only thing that would fail? Or a better question, "How would I test for stability?"

My temps while folding were getting up around 49-50C and now they are staying between 38-40C!!! Humungous impact. I may even be able to get my NB safely stable at 3000MHz and it does give me better memory latency and bandwidth by .6MB/s and 2.4ns lower. lol
Edited by BWG - 5/25/11 at 4:56am
 
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