Got an aorus master 3080 rev 1 and back up is an xtreme 1080 ti after that a 780, 470, 8800, and if really need got trusty 6600 gt x2 gigabyte but not sure if it works outside that motherboard never tried
Just posting results here tried 900mv at2025 crashed at 4 hours nlack ops cold war so lowered to 2000 and stays constant no crashes and 59c. This is on an aorus master 3080. Test xplane and msfs as well no crashing and59 to 61c on any game might try and up later to 2050 at 925
They are not necessary but can put less stress on the pcie slot from what I read I got one of these coming https://www.lian-li.com/gb-001/ my 1080 ti xtreme doesn't need it but I go a 3080 aorus master coming and its a big card. Also look at this from jay.