The 5 mΩ shunt resistor (before) (Image credit: u/thatavidreadertrue) 1 mΩ resistor stacked on top, reducing resistance from 5 mΩ to just 0.83mΩ (after) (Image credit: u/thatavidreadertrue) As always, a disclaimer is due: Messing with your hardware on this level can cause irreparable harm to your device, especially if you're not sure what you're doing. The machine is designed with a certain thermal and power envelope in mind, so bypassing that can only lead to so much improvement before you hit the point of diminishing returns. However, if there's room, Avid's shunt mod shows us it doesn't take much to raise the ceiling.
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Hassam Nasir Social Links Navigation Contributing Writer Hassam Nasir is a die-hard hardware enthusiast with years of experience as a tech editor and writer, focusing on detailed CPU comparisons and general hardware news. When he’s not working, you’ll find him bending tubes for his ever-evolving custom water-loop gaming rig or benchmarking the latest CPUs and GPUs just for fun.
chaz_music Given what has been happening with the GPU paralleled pin power connectors being damaged, I would warn anyone doing this mod to be careful. If you can, use an IR camera on the connectors on the GPU and the PSU side until you are sure it isn't overheating a wire/pin set. Or use a current probe to measure all the feed and return wire currents for balance. If the above is not available: At least do a "touch test" to see if the connectors and wires are getting too hot or are unevenly heating up. Do it often and repeatedly while stress testing the first half hour or so. The average user isn't going to recognize what 90 deg C feels like (It can cause pain!), but the average person can tell the difference if one wire is getting **much** hotter than the rest. That indicates unbalanced current flow and damage is going to occur. This is a very subjective technique, but at least this can help catch a true catastrophic failure from happening. Reply
Giroro " laptop was shunt modded by stacking a 1mOhm resistor on top of the 5mOhm shunt resistor " Oh cool, so now I'll have to go complain on a reddit post because the actual author of this story used unclear notation for the values of the resistors. Reply
_D_D What was unclear exactly? 1mOhm = 1 milliohm = 1mΩ = 0.001Ω = 0.001 Ohm 5mOhm = 5 milliohms = 5mΩ = 0.005Ω = 0.005 Ohm Reply
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Reference reading
- https://www.tomshardware.com/laptops/gaming-laptops/SPONSORED_LINK_URL
- https://www.tomshardware.com/laptops/gaming-laptops/rtx-4090-laptop-gpu-gets-20-percent-performance-boost-after-shunt-mod-consuming-up-to-240w-reduced-resistance-means-it-also-beats-the-mobile-rtx-5090-on-average#main
- https://www.tomshardware.com
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