I am pretty sure that these DR5 Sticks will not get nearly as hot
as my “8 - 240-pin PC2-5300 (667MHz) DDR2 ECC fully-buffered DIMM (FB-DIMM)”
in my Mac Pro 2.1.
At least when running with standard voltages.
It is just that those gaming DIMMs look like having large Heatsinks,
which are in large parts often plastic, and if metal, non finned.