OpenWRT One thermal pad thickness and thermal conductivity?

Greetings, all. First post.

I recently bought an OpenWRT One, and I’ve got it all set up the way I want…

  1. a hard drive connected to it and shared over the lan via Samba, with HD Idle to spin the drive down;

  2. using hardware offloading but limiting upload speed to just under the ISP’s limit to prevent bufferbloat and concomitant increase in latency under high data transfer rates: (I set up /etc/firewall.user, set it up as an include for /etc/config/firewall (option type ‘script’, option path '/etc/firewall-user, option fw4_compatible ‘1’), with the contents of that file being: nft insert rule inet fw4 forward oifname “eth0” limit rate over 3333 kbytes/second burst 5 mbytes drop);

  3. DoH, using DNS servers that do ad blocking;

  4. various tweaks, etc.

One issue: We’re in a warm area, so the OpenWRT One idles at 64 C. I want to order some Gelid Solutions GP-Ultimate 15W thermal pad material to increase heat transfer from chips to heat sink. I’ve also ordered a fan for it, to wash air over the outside of the case to increase cooling…

But I have to get the right thickness of thermal pad.

Google AI informs me its a 1.0 mm thick pads, but Google AI has been wrong before.

Anyone know what the actual thickness of the thermal pads is?