Today i watch JayzTwoCents and what he discover is insine.
If you use Geforce and Intel even you have Resizable BAR ON i bios and GPU-Z show its ON its really OFF.
and you have -10% FPS in games.
To fix this you need to download nvidiaProfileInspector and change this in 5-Common global:
rBAR Enable – Enable
rBAR Options – 0x00000001
rBAR size Limit- 0x0000000040000000