4850 pencil mod problems

[faithful10]

Hi all

I have tried raising my gpu voltage on my club 3d 4850 card, using the guide here: http://www.xtremesystems.org/forums/showthread.php?t=190990&page=5

In post #111 you can see that by shading between the 2 points should give me around 1.23-1.24 load.

I tried a lot of times and finally i got to work and it showed 1.24v. I worked perfect but a little later it suddenly showed 1.35v instead and i removed it.

I have since then tried to reapplay it, but there is no contact, and i have following qustions:

Should i try using a razor knife to remove some of the upper layer of the 2 spots to maybe improve contact?

Whould it be 2 dang. to use a conductive pencil(one you use to repair backwindow strings on cars). I used that for my 7950 gt to raise gpu v. or will it give to much connection and maybe to high volts then?.

I use this http://www.aanielsen.dk/grafik/dvm830.jpg to measure volt. How should i use it if i want to measure resistance between the 2 spots?

All answers and help is welcome.

Thanks alot in advice.

[largon]

There's no need to poke it with a knife as clearly, the mod works as you had vGPU at the figures you were looking for. The change in voltage was likely just caused by loose pencil flakes. Anyways, ultimately varying and unreliable results are typical for pencil mods.

Conductive paint pen will either kill the card or just render it temporarily inoperable.

To measure resistance set the dial to "Ω" and find the setting that gives the most acccurate reading.

PS. Pencil mods suck.
:fact:

[arroyo]

Hi all
In post #111 you can see that by shading between the 2 points should give me around 1.23-1.24 load.

I tried a lot of times and finally i got to work and it showed 1.24v. I worked perfect but a little later it suddenly showed 1.35v instead and i removed it.

It's normal if you were measuring thoose 1.24V in idle. Powerplay in 3D boost voltage a bit so if you measured 1.35 it's cool and normal. Also most of conductive pencils change their resistance as they dry. You should use normal 4B pencil.

1.35V is not too much for HD4850 if you have cooling other than stock and radiator on voltage section.