Not sure of relevance but *on my system* I encounter recurring but (seemingly) randomly triggered fps drops on various planes whenever I run DX12 rendering. Usually it's ok, but for example if I run GSX then my fps can drop by 50%. It is a real PITA - I want DX12 so I can pop out instruments with no frame hit but the in itself it can cause drops if something startles it....
Ignoring all this - my experience is close to @lowpolybuttBest performer is 737, 310 lower but great imo and Fenix which is always bringing up the rear (even then usable).