The diffrence is surely not 65% and in fact barely visible: https://techguided.com/single-channel-vs-dual-channel-vs-qua...
What's interesting here imho, is the staggering difference it makes on an CPU integrated GPU (which makes sense since the GPU is using the comptuer RAM instead of its own RAM).
Also, we've been told DDR5 had built-in dual channel on a single stick so I was not sure this would make any difference at all.