After installing the AMD chipset 15.7, the FPS games fell like the link below. This in any version of windows. Already installed versions prior to 15.7 Chipset and CCC, but the problem continues.
That is a fact , the FPS games fell, GRID Autosport no more than 30 (sometimes 20), before 50.
Windows 7 x64 + Windows 10 x64 - Dual Boot
Catalsyt 15.7.1 + AMD Chipset 15.7.1 - W7 and W10
4 GB 1866MHZ
FX - 6300 Black Edition
XFX R9 270
My result is P6155
* I'm from Brazil