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7300 GS voltmodding help - Page 2

post #11 of 16
Here you go wink.gif

First get a digital multimeter. Then check the resistance(card unplugged, no power) between both those green leg which i've labelled on the picture. Those are the points where you have to solder later for the vGPU mod.

Also I need the readings of those 3 smaller ICs.
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post #12 of 16
Subbed to see how this turns out

stock cooler?
Got some ocs at stock volts?

Thinking about vmodding my 8400gs but that's another story lol
    
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post #13 of 16
Quote:
Originally Posted by mAlkAv!An View Post
Here you go

First get a digital multimeter. Then check the resistance(card unplugged, no power) between both those green leg which i've labelled on the picture. Those are the points where you have to solder later for the vGPU mod.

Also I need the readings of those 3 smaller ICs.
I've not seen voltage control of this fashion. Interesting...
    
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post #14 of 16
It's abit off topic bust just have a look at my 8400GS mod, Pizza:
http://www.overclock.net/graphics-ca...-vmem-mod.html

Several low end cards use simple shunt regulators like that(instead of PWM controllers) to control VRAM voltage.

I'm not sure if one of those 3 is the one for the 7300GS' vMEM mod but they are all close to the VRAM caps and I can't see many other ICs so far.
Edited by mAlkAv!An - 1/16/11 at 2:37pm
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post #15 of 16
Can you explain how you work a shunt regulator mod? I'm use to just reading datasheets to figure out want needs to be done.
    
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post #16 of 16
Actually it is like this. The shunt regulator has got 3 legs: reference, anode and cathode.
You have to lower resistance to ground at the reference pin; cathode and anode remain untouched.

There might be shunt regs which behave differently, but thats how all correspondeing mods work I've seen so far.

The datasheets are usually very similar. Output voltage is determined this way often: Vout = Vref * (1 + R1/R2)
Where R2 is the resistance of ref pin to ground.
Edited by mAlkAv!An - 1/17/11 at 3:30am
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