That is weird... the GPU voltage shouldn't affect the memory voltage.

By the way, I'm getting the multimeter by tonight, Shah81.

Just got the multimeter.

This post has been edited by colinwong89: May 23 2006, 10:29 PM

What i mean was, the memory can go higher but limitation from the gpu core itself. So adding more voltage to the gpu core would give the mem some headroom to increase the speed in a limited margin.

got your multimeter....good

here's what you gotta do:
first measure your Vgpu....dont let it fry

next look at the pictures below





in the first picture i marked the shunt regulator(labeled as 1) and 2 resistor. although the shunt regulator looks like it have 6 leg, actuall it only have 3. the second picture is how the circuit actually look like.resistor A & B correspond to resistor 2 & 3 but i dunno if resistor A = resistor 2 or 3 in the first picture...so you have to find out yourself (use continuity test) and tell me the result.
next find the resistance at point F and the resistance of resistor A.

thats it for now....give me the result and i'll tell you how to mod it.

The first picture link is broken Shah81...

works ok for me

Okay, I got the picture now. Dumb Streamyx, had to disconnect and reconnect just to view it.

I have a few questions... how do I find the resistance of the resistors? Do I just point the multimeter heads at both of the resistor's connects? This can be done while the PC is off, right?

Any tips on how to get the resistance of Point F? I can't see which point of the resistor that corresponds to the shunt regulator.

By the way... before I go further, I think my multimeter is screwed. After setting the voltmeter range to 20v, I get awkward readings like around 270 on my multimeter when I test it on a 1.5v battery.

Again, please excuse me for the noob questions.

measure the resistance with the card out of your pc. point the multimeter to both ends of the resistor to measure resistance.

i cannot show you where point F is because the picture that you gave me is not clear. try taking a close-up picture with macro mode turn on and at highest quality and make sure your hand is not shaking.

you can find it yourself using continuity test with the multimeter. on the shunt regulator, find the leg that is connected to both of the resistor (2 & 3). that leg is Point F. the point where the resistor is connected to the shunt regulator leg is also point F.

for voltmod, u can try to lightly pencil on top of Resistor A (its either resistor 2 or 3, i dunno you have to tell me) or solder a pot from Point F to ground. but i need the resistance value to determine the value of the pot.

Alright, I'll do that. I'll try it soon as I get another multimeter. It read 2.1 volts on a 1.5v battery, and 1.9v on my core voltage. Obviously, the multimeter must be screwed.

Thanks for the help.

A clearer picture of the area.

very nice picture this time

ok in the picture below, the arrow is pointing at one of the shunt regulator leg. that is Point F. to find Resistor A, test the 2 resistor that i box out. the one that have one of its point connected to ground is Resistor A. the one that have one of its point connected to the mosfet is Resistor B. both of the resistor will have one point connected to Point F (ie: the shunt regulator).



you just marked where is Resistor A & B and where the points on each resistor that is connected to ground and mosfet and the resistance of Point F in the picture. i need to make sure that it is the correct place to mod

ok Good Luck

How do I determine the resistance of Point F, which is a node? What should I do to find out which resistor end is connected to the mosfet or the shunt regulator? Do I find the resistance, current, or voltage?

I should be able to get the readings by tomorrow. Sorry to make you wait.

This post has been edited by colinwong89: May 25 2006, 01:29 AM

bro...do you know how to use a multimeter?? do you understand the schematics that i showed above?? i have a feeling that u dunno how to use a multimeter and you dont understand the schematics. if thats the case, this is going to be hard but i'll try my best to help you.


point one of the multimeter probe to the leg of the shunt regulator that i pointed at in the picture and the other probe to ground point (u can use the -ve leg of the capacitor) make sure to set the multimeter to read resistance. start with the lowest setting and change to a higher settings until you get a readings. the available settings will be 200, 2000, 20K, 200K, 2000K.


use the continuity test on the multimeter, the one that have the diode symbol. point one probe to the leg of the shunt regulator/ground/mosfet and the other probe to any point nearby (ie: resistor). if there's a connection between the the 2 point, the multimeter will beep/emit a sound.


for the last few post, i only ask you to measure the resistance and check for the connections. nothing more nothing less.

To be honest, I'm not very good in using a multimeter. As I said, I'm a newbie when it comes to circuits and electronics.

Readings will come out soon.

don't worry...i'll try my best to help you out.

Sorry for the long delays because I am unable to get a multimeter in hand yet, but I'll give you the readings ASAP.