We highlight VRM temperatures when using each cooler on our Gigabyte B550 Aorus Master motherboard with the overclocked Ryzen 9 5950X. Do note that the results are heavily influenced by the specific layout of the Gigabyte B550 Aorus Master test motherboard with respect to top-side or rear IO-side VRM components. So your findings may vary if you have a different motherboard VRM layout and heatsink design.
VRM cooling is simply mediocre and is nothing to be particularly impressed by. With a test system similar to ours, the Fractal AIO should provide enough incidental airflow to keep the VRM sufficiently cooled.
But if you have a motherboard with lesser performing VRM heatsinks, don't expect the Lumen S36 RGB to compensate in terms of VRM cooling.