Why hasn't there been any responses to your topic?
It's actually something very important. I recently did a thermal pad-swap because of your topic. You encouraged me to make it.
I did however a modification to your Thermal Mod. I used the thermal pads from your post (1,5mm thick as you recommended) but only on the bottom side of the motherboard. On the CPU / GPU I used a "24 carat diamond thermal compound" paste on both. After changing those goo-things they used on the Dreamcast, I noticed that the bottom got a lot hotter of the console (which is good since this means the heat comes out instead of keeping it in the console)
So I got rid of the "Laser in console, don't look inside the laser"-bla sticker to get more of the ventilation holes open (I think this is only on the PAL consoles...?)
Then I swapped the little plastic feet of the dreamcast with those: https://www.amazon.de/gp/product/B00AJI ... UTF8&psc=1
So the Dreamcast has a wider opening on the bottom. Since I use the USB GDROM and I don't have the DreamPSU (yet, but it's preordered) my Dreamcast tends to be a lot hotter. So I *also* did the 300ohm resistor mod. Since then (your mod, my rubber feet idea) the Dreamcast is stone cold. And works like a charm. So if anyone thinks of changing the thermal pads - do it, you won't regret it. Technology has advanced in the past 20 years and those thermal pads / paste do magic to your consoles