Lenovo Z575 AMD/ATI Radeon 6550M + 6520 Drivers Issue?

Hello guys, I have changed my system to windows 8.1 prof, from windows 7 ultimate and im having many difficulties finding proper drivers for my GPU.

official lenovo site provide quite outdated drivers for my gpu and still without Catalyst manager therefore it sux.

Amd site however has the latest drivers but it often makes my laptop crash with a bluescreen.

Standard windows 8.1 drivers are just average cause they doesnt provide much power. On lenovo site drivers on windows 7 i've had for example stable 150 fps on the lowest and 60 fps on highest graphics detal in league of legends and now? On any driver at windows 8.1 on lowest details its lagging with 40 fps going down to even 15 fps.

Does anybody know some website with decent drivers?

Read more: Lenovo Z575 AMD/ATI Radeon 6550M + 6520 Drivers Issue?