I've been trying to use very high FPS.I tried 500 and to my surprise I it isn't even stable and drops to low 300s or even less I think I saw.

Other(s) say they can achieve high solid FPS when they test.

Person: "if i limit to 10000 fps"
Person: "it spikes to like 1500"
Person: "but steady state ~600"

No change with default TFC.

Specs:
i7 6700k 4.6
16GB DDR4 3000MHz XMP
RTX 2070 EVGA
240Hz XG258Q Anus