[StillBored]

I put a fairly large/flat heatsink on the back metal of the heatsink support bracket on my intel (overclocked) desktop a few years back it pulled the temps down a couple degrees when a fan was blowing at it under moderate load.

I've been thinking about this for my ryzen lately too, since it appears keeping the top of the die cool is unusually challenging. A lot of mobile/etc parts use the PCB ground plane as a heatsink, so it makes sense that if you can attach a larger heatsink to the back of a normal PC board you should be able to pull heat out of both sides. Particularly in a water cooled system where the top of the heat spreader is remaining fairly cool but the surrounding board is heating up (like my ryzen).