Titan X (Pascal) Shunt Mod Done With Resistors - Page 5 - Overclock.net - An Overclocking Community

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Titan X (Pascal) Shunt Mod Done With Resistors

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post #41 of 46 (permalink) Old 10-16-2019, 07:56 PM
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Just a heads up on this mod. Personally I went the liquid metal route from day 1. Not sure if the same problem could pop up with 2 resisters stacked, but what I found was that due to the increased heat over the resistor, the solder would actually get hot enough to melt. After about a year, the resistor had fallen off the board on one card. This actually was a huge problem because I didn't realize what had happened. My computer shut off, and wouldn't come back on. Bought a new motherboard because I was getting mobo error codes. Didn't work. Then I noticed the resistor had come off. So I resoldered it, and my computer still wouldn't turn on. Fortunately I had a second computer at that time so I was able to test that the video card was working properly now that the resistor had been reinstalled. However, in the process, it had burned my CPU. No idea how. But just a recap:

- Did liquid metal resistor mod
- Got so hot the resistor actually fell off the board after a year
- Killed CPU
- Resoldered resistor
- All working fine now

So if you get a scare and something happens, your video card may not necessarily be dead. Check your mod. On my second video card, the resistor had shifted, but not fallen off yet. It can be very hard to solder the resistor back on the board. On one of my cards, I had to run 30 awg wire from other contact points on the board that were connected to each end of the original resistor location, and attached those wires to a new resistor.

I think I ended up using a healthier dose of solder this time around, along with supporting it with 100 degrees celsius rated glue sticks, which I could take off in the future if needed.

So based on that experience, my recommendation would be to not stack the 2 resistors on top of each other, but to run a wire from the original resistor to the new one, mounted a bit farther away.

Cheers.
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post #42 of 46 (permalink) Old 10-17-2019, 02:46 PM
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Quote: Originally Posted by HyperMatrix View Post
Just a heads up on this mod. Personally I went the liquid metal route from day 1. Not sure if the same problem could pop up with 2 resisters stacked, but what I found was that due to the increased heat over the resistor, the solder would actually get hot enough to melt.

Snip.

I think what you've experienced is more in line with the liquid metal eating away at the solder joints and not heat.

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post #43 of 46 (permalink) Old 10-17-2019, 06:24 PM
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Quote: Originally Posted by chibi View Post
I think what you've experienced is more in line with the liquid metal eating away at the solder joints and not heat.
Certainly possible. But how would the liquid metal work its way upwards to the solder connecting the resistor to the board?

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post #44 of 46 (permalink) Old 10-20-2019, 02:18 PM - Thread Starter
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Quote: Originally Posted by HyperMatrix View Post
Certainly possible. But how would the liquid metal work its way upwards to the solder connecting the resistor to the board?
This is the well known issue with using liquid metal. It is exactly the reason not to use liquid metal. The gallium is soluble in the solder, it will wick its way through it. Gravity is not enough to prevent it, it is like how water will climb up cloth or paper if you dip a corner in it. It takes a long time with gallium and solder but it will make it there eventually, assuming there is enough gallium to 'wet' all the solder.

It definitely wasn't heat, if the resistance was high enough to get hot the GPU would think it was using a crazy amount of power and instantly throttle. This mod works by lowering the resistance, a lower resistance causes the shunt area to generate less heat for the same amount of power and only the same amount of heat at the new modded power limit if the GPU was hitting it 100% of the time.
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post #45 of 46 (permalink) Old 10-20-2019, 09:01 PM
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How feasible is it to run the shunt mod on the stock air cooler? Blower style for the Titan Xp. I have my blocks disassembled right now and not sure I want to go back to watercooling for the time being. Getting tired of the yearly maintenance lol.

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post #46 of 46 (permalink) Old 10-21-2019, 11:48 PM - Thread Starter
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Quote: Originally Posted by chibi View Post
How feasible is it to run the shunt mod on the stock air cooler? Blower style for the Titan Xp.
Honestly I wouldn't do it myself. The VRM cooling would worry me and they already get pretty hot with the blower coolers. The power/heat for performance trade off due to this mod is not great, Nvidia can save a surprising amount of power/heat without hurting performance too much

If you don't go crazy with the overclock, or especially voltage, it would be fine; no fires or anything. Just not really worth it.
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