Great solution, thanks for sharing!
Surprising the temps are lower with those fans
I have some of the 1070 version of that card (and some of the 3-fan versions), ALL of which have had fans die or are starting to lose fans.
I have a bunch of NMB 92mmx25mm fans around - server-case fan design for about 40 CFM rated .35 amp at 12VDC.
I've been pulling the entire fan shroud assembly, twist-tie one NMB fan to each heatsink assembly, then wire them up to the *5 VDC* connection on a MOLEX - they toss enough air through the HS to do BETTER cooling than the original fans did at up to 80% or so, while using a LOT less power.
The original Gigabyte fans are JUNK on their current Windforce models - dunno why they moved away from ball-bearing fans a few years back except on the Aorus models, but it has cost them any chance of selling ME any more cards.
The AORUS models still have good ball bearing fans - but they tend to be high-end models with extra power connectors that make it harder to power a bunch of them for mining usage.
EVGA and Sapphire are still "all ball bearing, all of the time" and are my go-to brands - I just wish Sapphire made Nvidia cards.
Those 92mm fans have a similar CFM to the ones I got.
My Question though, you have only 1 fan attached to the card? and does it do a good job? so far I'm tying 2 fans to each card, which does an insanely good job at cooling, but I think one fan could be enough, especially that one of these fans produces a higher CFM than both stock fans added together.