I have an AMD6300 will clock to 4.2ghz during game, 8gig mem, and a AMD480 8gig card @ 1330mhz usinf a 144hz Freesync 24inch monitor res 1900x1080
Only with WOFFUE do I get disappointing results after upgrading from a AMD270 2 gig card.
These FPS results strike me as odd..surely if your getting say 26FPS at x6 speed you should then be getting more than just a 10FPS or so increase dropping down to normal speed..
I don't know your circumstances Wodin, but one thing comes to mind and that is the FPS is very dependent on where in the WOFF world you are flying. FPS drain can be significant depending on the complexity of the area you are in. Try to always duplicate the location and direction you are flying when testing in order to keep commonality during the test.
This doesn't answer your question but will help with consistency during your tests.