cirro Posted June 27, 2008 Posted June 27, 2008 Okay, so originally my 780i i found out after I started to OC had an ENORMOUS vdroop (sometimes depending on the rising vcore) it would get up to nearly 0.06, so i did the vdroop mod (pencil) , then had a little instability at first, then i re-did the pencilling(?) and it re-gained stability, but anymore i notice that its coming back , i assum i addded to much,but now for some reason it can grab itself (at peak load only) +0.03 onto the Max Vcore i set in bios can i just erase it and try it again? or will i usually get these results with a pencil mod? Share this post Link to post Share on other sites More sharing options...
SMeeD Posted June 27, 2008 Posted June 27, 2008 The penciling could be wearing away a little bit. You can try a metallic pen which you can find at radio shack or any type of metallic paint. I went out and bought a repair kit for rear window defroster leads and used that for my ultra-D SLI mod and its been fine for a year or two. Share this post Link to post Share on other sites More sharing options...
hardnrg Posted June 27, 2008 Posted June 27, 2008 do NOT use metallic paint or other conductive pens for a pencil mod!! a pencil mod lowers the resistance of a resistor by making a parallel resistor network made up of the resistor and a layer of graphite laying on top... metallic conductive ink/paint would effectively making the resistance zero, and for a volt-mod, this will mean serious damage and disaster erase the graphite off the resistor... start again... maybe use a different value pencil like I used a 4B instead of the suggested 2B so that the graphite is "thicker", and then I put a piece of clear tape over it... I did the pencil mod while the system was running, and I used Prime95 v25, OCCT v2, and HyperPi whilst having CPU-Z open in order to determine the idle/load vDroop and eliminate it... Share this post Link to post Share on other sites More sharing options...
SMeeD Posted June 28, 2008 Posted June 28, 2008 a pencil mod lowers the resistance of a resistor by making a parallel resistor network made up of the resistor and a layer of graphite laying on top... metallic conductive ink/paint would effectively making the resistance zero, and for a volt-mod, this will mean serious damage and disaster Haha, oops that wouldnt turn out so hot. I guess I didnt realize how it worked Share this post Link to post Share on other sites More sharing options...
The Smith Posted June 28, 2008 Posted June 28, 2008 (edited) I have another suggestion. Instead of putting a piece of clear tape over it , take your glue gun and put some on the resistor. It hangs better and it is also easy to pull off. @Hardnrg: I did a vdroop on my P35-DS3R by soldering the two legs of the resistor. Two weeks after I un-modded it there was no damage. And I saw on many websites that conductive ink is a good idea. So you say that it would be better to solder another resistor in parallel ?? Edited June 28, 2008 by The Smith Share this post Link to post Share on other sites More sharing options...
Branjo Posted June 28, 2008 Posted June 28, 2008 With a pencil the mod is completely reversible. Share this post Link to post Share on other sites More sharing options...
hardnrg Posted June 28, 2008 Posted June 28, 2008 @Hardnrg: I did a vdroop on my P35-DS3R by soldering the two legs of the resistor. Two weeks after I un-modded it there was no damage. And I saw on many websites that conductive ink is a good idea. So you say that it would be better to solder another resistor in parallel ?? On the reference 680i/780i boards, the vDroop mod relies on lowering the resistance value of one of two resistors. This can be achieved fairly easily and with a decent amount of control using the application of graphite from a pencil. Hard-modding the voltmod with a variable multi-turn resistor (18- or 24-turn) would be a more precise method that you could tweak easily by simply turning the resistor, but soldering to SMD components is quite difficult in comparison to simply drawing with a pencil It's quite easy to desolder an SMD resistor when tacking on wires to each end, so I'd only recommend it if you are 100% confident with your soldering skills. Just don't use a standard single turn variable resistor (potentiometer) as the precision is nowhere near suitable. Share this post Link to post Share on other sites More sharing options...
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