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post #1111 of 1500
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Quote:
Originally Posted by DOM. View Post
okay its 1.502k ohm how do you find out wut vr to use ?
You want to only slightly lower the resistance, so you want to use ~20 times the currant resistance. 1.5 x 20 = 30K. Doesn't have to be exact. Anything 20-40k range should work well. Now if it was memory you where consdering, you would rather round higher to a 40K VR.
    
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post #1112 of 1500
Quote:
Originally Posted by DOM. View Post
okay its 1.502k ohm how do you find out wut vr to use ?
This way: http://www.overclock.net/graphics-ca...l#post11985620

Often the original resistance is multiplied by x20 or x30 to get the size of the proper VR.
In your case I would use a 50k VR.


Edit, too late
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post #1113 of 1500
I can't find a vmod for my asus en9600gt. I found the one from pizzaman @ XS but my pcb is diffrent.







Hard to read what's on that ic, but it says AA-AH 41K.

Mosfet driver is an RT9607
The ic in the top right corner of the 1st pic is an APW7065, looks like the pwm controller for the gpu voltage. I'm going to try it out.
Or is it the ovp ?

Resistance between ground and pin 6(FB) is 2.78KOhm


Calcs:
Vout = 0.8+(1+(R1/R2))
R1 = ~1K (specified in the datasheet example that outputs 1.2V with R1 = 1K and R2 = 2K)
0.8*(1+(1000/1760)) = 1.25V

I guess 100K would be enough, as long as it doesn't go above 1.3 I'm fine with it .

Well i measured the voltage without mod, and when folding it's around 1.20V. I don't understand why i can't push my shaders above 1850 then as a lot of people get 2000mhz. I'm going to try 1.30V tough.



Vcore does not change when i flip the switch ... So that might be the ram voltage. Guess I'll be adding a ram voltage readout.
If you short it, it goes into OCP so (1.08V)...
Edited by nicksasa - 3/2/11 at 3:15pm
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post #1114 of 1500
Nobody ? I know that small IC is the pwm controller, it's used on some asus 3650 card i think. I found a vmod for that one but voltage doesn't change
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post #1115 of 1500
There are no pdf's for this IC.. you need to resort to 'toning' the pins to ground, from there measure resistance on all pins that are directly connected to ground. Once we have this, you can trace to a resistor for pencil mod testing.

*I have found many inquiries on the web in regards to this IC..no resolutions posted though.
post #1116 of 1500
I'm close to giving up on this. Why couldn't asus do like the other companies and use a real pwm controller >_>

I can give you the resistance for each pin from the ic to ground. But it's not so easy, the ic pins are very small as it's a little tiny ic .
Edited by nicksasa - 3/4/11 at 12:09pm
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post #1117 of 1500
I'm going to pencil every resistor one by one and see what it does.
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post #1118 of 1500
Sorry for the bump, but I found the FB pin ! with my 100K VR it's at 1.234V. Maybe i can find a 200K one around here in my collection.
I will post the pic soon, but I'm going to see what it can do first.

Also a tip. Connect the VR after windows is booted, otherwise the voltage doesn't change.


Meh, can't get 2000Mhz shaders folding stable, i tried up to 1.31V as I'm not sure what the max voltage is.
With the stock 1.20V i can get 1850Mhz stable. I need 1.27V for 1900Mhz ... Not worth it.




Edited by nicksasa - 3/5/11 at 10:01am
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post #1119 of 1500
Thread Starter 
Do you know which pin it's connected to?
    
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post #1120 of 1500
Sorry, no. It's hard to measure on those pins. Even with a wire the size of a hair.
I'll look tomorrow if i can figure out wich pin it is.

Any ideas on how to get the shaders higher ? I have some 16V 470µF caps and like 25 63V 1000µF caps if that would help at all. No solid caps, i don't have anything die on me yet.
Edited by nicksasa - 3/5/11 at 1:07pm
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