I see, that was the reason for my question regarding, ND-filters :)
I have a PC for sale that's plenty capable of 4k editing, Ryzen 2700x with a Noctua NH-D15 cooler, 500gb Samsung 960 nvme SSD, 2x8gb 3200mhz cl14 Trident Z memory, X470 Crossfire hero VII motherboard, 750w Corsair 750hx PSU and...