Discussion in 'Articles' started by Urlyin, Sep 30, 2004.
To read this article go to: http://www.techpowerup.com/articles/overclocking/voltmods/101
it seems like u found out i am always here to look for updates
are you following me okay? Hugo
so far so good
but where is the resistor for vmem???
R311 in pic3 second row down from pin5 (vdd) ... just couldn't wait
the one with "108" ??? hard to read
my pencil is ready~~ my gpu is 590 now, i want my vmem to b 590 too~~
that's the one ... go easy if you're using a stock HSF and you should do the VDDQ which is R256 in line like the VDD R311 under pin 5 second row...
mine is HIS iceq x800xt, which comes with silencer4
it should be alright
Hugo you can measure the VDDQ from the backside. Next to the resistor R256 looking from the top of your card down to the capacitor C110 next to R256 on the left side. It's the backside of the cap so all you see is two silver dots. Measure from the bottom dot to get your VDDQ voltage...
weird, after i modded vdd and vddq, my card cannot run stable at 590/530, where it used to be without artifacts.....
anyway, i will try to pencil mod again this afternoon
goin to sleep now~~ it's 4:46am in NZ
btw, thx alot Urlyin
Did you go to high ? do the vmem first, just go up to 2.08 and test the card... my memory didn't really take off until I did the VDDQ ...
I'd assumed that was the same as the VDD. If I recall the voltage didn't change when I penciled R256. I'll have to double check that one. I was able to verify voltage change on the backside of C110(right next to R256) which is one of the Caps John said to check on the front side.... Thanks for changing the pic though
i'm pretty sure the measurement points are right ... i measured them .. both have a different voltage
I stand corrected ... that measure point does indeed work... better than reaching down to the bottom of the board... checked it before and after VDDQ mod... voltage changes
wat about overcurrent mod???
is that important???
wat does it do???
Hugo did you correct your problem with the VDD and VDDQ vmod? The board has a limit for vcore voltage, once you reach it the card will shutdown. The over-current allows you to go past the limit. Which I wouldn't recommend ...
my card is running fine with 572/572 now
I am a wuss ! I want to do this so bad but I am very afraid of frying it ! I could send it to viper john I guess. I want 550/575 stable.
I just want to post these to let someone who can tell me if I have taken it to far. Start voltages on the vmem was 2.09. And on the vddq it was 2.02. Then I took the card out and check the ohms reading. For the vmem resistor it read 993, and on the vddq resistor it read 767. Now these were allot more touchy when it came to the graphite than the vcore resistor was. It was hard to get them down by 30k ohms. I got close with both of them, then I would either add a little graphite, or try to take some away then it would be way off. Anyway on the vmem, I went from 993 to 962. This up my voltage for the vmem from 2.09v to 2.17. On the vddq, I went from 767 to 739. This up my voltage on the vddq from 2.02v to 2.08. Are these numbers within reason. I can now get all 600MHz out of my memory chips. I haven't checked how far the core will go now. I've been running it at 540MHz. Please let me know if these numbers are reasonable. Thanks!
Quazi... everywhere I've seen the default of 20k on both the vmem and vddq. Looks like you stayed within 8 volts... the only thing you need to watch for with the vddq and vmem is that your memory chips don't get to hot. Your not using stock HFS not sure if you have passive heat sinks on the memory but you should be okay ....
I'm still a little unsure about the pencil line 'adding' process.
Do you make a line/trace on the resistor (top) from end to end.
Or at the side? or do you make a trace on the PCD between the two ends & avoid the res totally.
How about a little video?
Along the side... starting at the soldered end to soldered end. Gently run the 2b pencil along the side of the resistor... Does that help?
So you rub the side of the resitor with the tip of the pencil, kinda like shading in?
Shading in would be too extreme ....just sharpen your 2b pencil, run it back and forth on a piece of paper to take the sharp point down a little. Looking at pic3 in the begining of this thread. Which you should read the article if you haven't yet. Look at one of the resistors that are black with a number on it. Place your 2b pencil at the silver end (soldered) at one end, gently run it across the side of the resistor to the other silver end. It doesn't take much to reduce the resistance. A couple of swipes should do it... Are you using a multimeter?
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