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-   -   Titan X (Pascal) Shunt Mod Done With Resistors (https://www.overclock.net/forum/69-nvidia/1704002-titan-x-pascal-shunt-mod-done-resistors.html)

Asmodian 07-21-2018 01:42 AM

Titan X (Pascal) Shunt Mod Done With Resistors
 
Credit to R1fast on reddit for finding the correct resistors. I was able to find them on Mouser: Panasonic ERJ-M1WSF5M0U

It was a slightly messy soldering job but that is much better than getting the board too hot or getting solder where it shouldn't be. A small bead of solder was placed on each end of the original shunt resistor and then the new resistor was held in place with tweezers while heating one end at a time with the soldering iron until the bead under it melted. The original resistor did need to be pretty warm before the solder would stick to it.
http://i1222.photobucket.com/albums/...psd5l7ngec.jpg
http://i1222.photobucket.com/albums/...psxheaei7c.jpg

It worked absolutely perfectly. Power use is reported as exactly 50% of what it used to with the same load. Real world performance improvements are minimal but the power limit never triggers anymore. :D

Minium 07-21-2018 06:05 AM

Thats how its done right. Shorting them with liquid metal only gives you problems and its messy.

Thumbs up !

Asmodian 07-21-2018 10:37 AM

Thanks! This certainly feels a lot more permanent and precise. I also mount this GPU vertically so liquid metal would be even more dangerous than it usually is.

I did try with a silver pen first but it didn't have any impact on measured power use. :o

I was pleased with how easy it was too, it wasn't much more difficult than applying liquid metal and a barrier to protect the rest of the board. No worry about metal incompatibilities or it moving/dripping. I also still know my real power draw, simply double what is reported. :)

chibi 07-24-2018 09:33 AM

So is this just the exact same OEM resistor stacked ontop of the existing one? What is the reason for doing so if I may ask? Does this method have some parallel do-hicky magic to lower the power limit? I am confuzzled :thinking:

Renegade5399 07-24-2018 09:52 AM

Quote:

Originally Posted by chibi (Post 27548232)
So is this just the exact same OEM resistor stacked ontop of the existing one? What is the reason for doing so if I may ask? Does this method have some parallel do-hicky magic to lower the power limit? I am confuzzled :thinking:

2 resistors of the same value attached in parallel gives you half of their individual resistance.

2 8 ohms in parallel = 4 ohms.

Math checks out as he's seeing the load at 50% less than before.

Asmodian 07-24-2018 04:07 PM

Quote:

Originally Posted by chibi (Post 27548232)
So is this just the exact same OEM resistor stacked ontop of the existing one? What is the reason for doing so if I may ask? Does this method have some parallel do-hicky magic to lower the power limit? I am confuzzled :thinking:

Exactly, as already mentioned adding another resistor in parallel halves the resistance. The GPU measures power use based on the voltage drop. Using V = IR half the resistance means half the voltage drop so the GPU thinks it is using half the power it really is. :D

chibi 07-25-2018 10:44 PM

Very cool, I just ordered a set of resistors and will solder them on during my next maintenance break down. Should help hitting the PL with my new 3440 x 1440 display. :thumb:

GnarlyCharlie 07-26-2018 08:15 AM

Here's the same mod I did back in April 2017

https://www.overclock.net/forum/69-n...l#post26055602

If you open the image in a new tab you can enlarge it a bit more.

https://www.overclock.net/photopost/...untStack1.jpeg

Asmodian 07-26-2018 02:10 PM

Very nice, I am glad to see another proper power limit mod. You seem to have been able to solder them on with a bit less solder added too. :)

Did you have trouble getting the solder to stick to the original resistor? I had to turn up the temp on my soldering iron and heat it up a bit more than I wanted to before getting good adhesion. :o

GnarlyCharlie 07-26-2018 05:39 PM

I tinned the new resistor, spread flux on the solder pads of the existing resistor, and soldered using some quad eutectic solder and a small chisel tip. I solder at 750 °F for most things, get in and out without staying too long on the part. I don't remember it being too tough, just nerves over trashing a $1200 card.

If I had it to do over, I'd use 2M0 instead, but it's under a water block in a full loop and I'm not pulling it out to change it.


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