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Looking for suggestions to go about attaching a copper block to GTX 970 VRM

post #1 of 3
Thread Starter 
So I'm sure this can be done easily simply drilling 2 holes into the heat-sink, threading it and running a screw in the original holes place and use a new thermal pad. Easy. However, I am in no rush to do this, so I am curios of how anyone else would go about doing this, but also mounting 1 or 2 of those 40mm fans shown in the pic. Both side-by-side are too long and extend a little over the copper. It's very thick, even the fins, so it may not even need either fan honestly. I'm thinking the simplest and easiest way would be to just drill 8 holes - 4 for the one fan, 2 for the other fan (2 will be hanging off the heatsink due to being too long) and 2 for the copper block and just use the screws that came with the 40mm fans to attach the fans, though they'd have to be trimmed a little




Edited by moccor - 10/26/15 at 11:37am
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post #2 of 3
I use Amazing Goop/Lexel/Shoe Goo on the corners of heatsinks and TIM on the appropriate surfaces. This depends on the hardware though. If it is under warranty or you may consider changing it in the future then you don't want to glue it down anywhere that has tiny resistors, capacitors, or the like which could get pulled off during removal. I've used this method for more than a decade and other than the long (4+ hours) cure time it has been very effective. I recently tested out an old video card that I had strapped a stock Socket 939 heatsink on to and it still works fine after nearly 10 years.

Same with the fans. I would find some plastic or aluminum sheet (new or used) to make a duct or shroud to help direct airflow and just figure out how it will go together with a dry fit. Line everything up and glue it down. I particular like those kinds of glue because they have great holding strength, yet it is 'rubbery' and can be peeled back by starting at one edge and slowly pulling it apart.

It would probably be best to drill and screw down the heatsink, but for the fans I would just glue them down or find a larger fan that can be ducted or positioned nearby to cool that area. If you do drill for the fans, I don't think you really need all 4 holes for mounting. They probably don't need to run at full speed either. That will help keep noise down and reduce the chance of irritating vibrations.
post #3 of 3
Thread Starter 
Thanks for the ideas. Yeah I wish I kept a GPU long enough to be able to glue heatsinks onto it, but this GTX 970 has probably 2-3 years warranty left on it so I'll try to keep it in RMA condition until the warranty is over. Well my case is a ITX case, so there isn't really cool air to be directed towards the heatsink, but the fans will definitely pull the heat off and the top 2 fans will pull it out. I like the idea of gluing the fans onto the heatsink, Though I am sure it wouldn't reach 90-100C, I'd need a glue that would tolerate those temps in a worst case scenario. Gorilla Super Glue seems to be fine wit 200-220F and I highly doubt the VRM would even reach high temps with this big block and fans. Don't really have any open PCI slots to use a bigger fan with fresh air, but I think the 2 fans would be completely fine being glued and shouldn't cause any noise or vibrations, they're pretty quiet. But I could also use the rubber piece that came with each of them to ensure further that they don't vibrate. But I'm not sure what temperature the rubber would be fine with so maybe not
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