DDR4 and 5 both have similar heat sensitivity curves which call for increased refresh timings past 45C.

Some of the (legitimately) extreme overclockers have been testing what amounts to massive hunks of metal in place of the original mounting plates because of the boards bending from mounting pressure, with good enough results.

On top of all of this, it really does not help that we are also at the mercy of IMC and motherboard quality too. To hit the world records they do and also build 'bulletproof', highest performance, cost is no object rigs, they are ordering 20, 50 motherboards, processors, GPUs, etc and sitting there trying them all, then returning the shit ones. We shouldn't have to do this.

I had a lot of fun doing all of this myself and hold a couple very specific #1/top 10/100 results, but it's IMHO no longer worth the time or effort and I have resigned to simply buying as much ram as the platform will hold and leaving it at JEDEC.