"KalmX AMD Edition" - RADEON RX 6400 Passive Cooling Mod

[robbee]

i dont know how to attach the copper heatsink to the CNC copper plate. I found a thermal adhesive on amazon. https://amzn.eu/d/037UTEx4
is it able to do the job?.
Also do i have to replace the termal pads for better performance?

Low temp solder paste. There are mixtures of Tin and Bismut that melt at about 140 degrees. There are also some silver infused mixtures that melt at about 180-190 degrees with better heat conductivity, but that shouldn't be required if there is a lot of surface being soldered together.

 

[FlexxRocket]

can i bake it in my oven or is it so toxic that you have to get a seperate oven just for this process?
sorry for these questions i am new to this

 

[robbee]

can i bake it in my oven or is it so toxic that you have to get a seperate oven just for this process?
sorry for these questions i am new to this

I wouldn’t advice it. A kitchen oven is good enough as you don’t need very exact temperature control, but I wouldn’t cook in it after you’ve used it for soldering.

 

[FlexxRocket]

So i could by a cheap Pizza Ofen to bake it there ?
Like for 25€

 

[REVOCCASES]

Yeah, that's what I did works very well...

 

[FlexxRocket]

Yeah, that's what I did works very well...

I bought one . When all the Parts are being Send to me i will Upload a Post about the Whole Process of copper modding my rx6400 eGPU and 3d Printing the case

 

[FlexxRocket]

The copper Platte Just arrived!
In the 3d file the holes were 2mm in diameter
So i would Drill the holes to 2.1 mm and cut the Threads with the M 2.5 thread Cutter
This is How you did this also ? @REVOCCASES

 

[robbee]

A 2 mm hole can be tapped to M2.5 just fine

 

[FlexxRocket]

Ok then i will Just cut the threads, thanks!

 

[REVOCCASES]

Just go slow and use enough oil, if you cut dry or too fast, your tap will likely break

 

[robbee]

If you don't have cutting oil, high fat milk works well too with copper. Make sure the tap doesn't tilt when you're cutting. This works best if you put the tap in a drill press and then spin it manually with your hands.

 

[REVOCCASES]

If you don't have cutting oil, high fat milk works well too with copper.

Next level Lifehack

 

[robbee]

Next level Lifehack

It’s how I did my first taps aluminium tapping was done with wd40. Nowadays I’m still using your awesome design for a tapping station but with proper cutting oil

 

[FlexxRocket]

@REVOCCASES what thickness are your thermal Pads? Because i think 0.5 mm is too much .
The gap between Cooper plate and Chip is too big i think ( when using 0.5mm pads)
Are these pads neccesery?

 

[FlexxRocket]

Because without the two additional pads the copper Plate is Not parallel to the card

 

[REVOCCASES]

@REVOCCASES what thickness are your thermal Pads? Because i think 0.5 mm is too much .
The gap between Cooper plate and Chip is too big i think ( when using 0.5mm pads)
Are these pads neccesery?

Sorry, my picture is misleading. I noticed the same like you and ended up using paste on the memory, just missed to update my post. The gap between GPU die and memory is very small, maybe just 0.1mm.

 

[FlexxRocket]

One Last question :
I am a beginner to Solder paste :
My idea was to put this solder paste:

Amazon.de

On top of the copper plate like this:And then putting it With the copper heatsink in the pre heated Pizza oven at 140 degree celcius for about 5min(?)
Do you think that would work?
Thanks in advance
( of course i will remove the card before putting it in the oven)

 

[REVOCCASES]

One Last question :
I am a beginner to Solder paste :
My idea was to put this solder paste:

Amazon.de

On top of the copper plate like this:And then putting it With the copper heatsink in the pre heated Pizza oven at 140 degree celcius for about 5min(?)
Do you think that would work?
Thanks in advance
( of course i will remove the card before putting it in the oven)

the paste look good...

no need to spread it, just apply some circles or lines but not use toooo much... leave some distance from the threads, e.g.:



after applying the paste, you should clamp / fix the two parts somhow, else they'll move during soldering... e.g. use some metal clips:



since you don't have any heatpipes, you can just set the oven to max., also no need to preheat, the small pizza-ovens will get hot fast enough.

observe the parts and when you see some silverish shiny solder come out of the gap between the parts, you can turn off the oven. let the parts cool down inside the oven with the door open... done!

 

[FlexxRocket]

How do i prevent the paste going into the threads?
2 of the 4 Threads are Outside of the heatsink ( See the pictures) and two are directly under the heatsink .

 

[REVOCCASES]

How do i prevent the paste going into the threads?
2 of the 4 Threads are Outside of the heatsink ( See the pictures) and two are directly under the heatsink .

Like I said above, keep some distance from the thread holes and don't use too much paste.

I'd place the small copper plate above the heatsink during soldering. For safety you can also screw in those two screws during soldering.