Another method was to borrow from the design of 486 clip-on heatsinks. I cut off the clips from a black 5.25" bay cover. I then took a belt sander and made them a lot thinner so that the clips had some bend to them. Then JB-Welded them onto a chipset heatsink from a dead 2000's era motherboard. After drying, there's a clip or two which needs to be a good half-mm tighter, so I was think that I could either add some masking tape, or apply some more JB-Weld epoxy and file it down to size.
The problem with this design is that the heatsink can technically slip off from the two ends that do not have clips. On the 486 clip-on heatsink approach, the open ends have a raised lip to prevent this. I was thinking that I can either, a) make the clips sufficiently tight so that the heatsink is unlikely to slip off, or b) mask out two likes on the heatsink where the CPU will reside and lay down some epoxy to create a raised edge.
Due to the rarity of this CPU, I didn't want to use heatsink compound, thermal epoxy, or thermal tape due to fear that it will remove the surface font.
The fan is 5 V and 6.9 mm tall. I will add a connector to the wires to connect to the 5 V line of the molex.
I haven't done the masking out for the raised lip or tried to tighten the clips by adding an epoxy filler yet. I want to give the JB-Weld 24-hrs to dry first. What do you guys think? Is there a better way to do this?
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