Have you ever encountered reduced performance when using dual graphics config on a amd system.?
I am using A10-7850k APU which has R7 graphics along with a discrete r7 250 OC 2GB ddr3 card.
IGD was kept as FORCED 2GB in bios.
If we connect display on IGD the AMD Radeon settings will show primary as R7 Graphics and the other R7 graphics as Linked card.
*This setup is a total waste as the combined performance will be a mess slow.. (GPU-Z shows ULPS active // whether it is on or off), no go
So, connect the display on discrete card and see the difference, AMD Radeon settings will show primary graphics as '''R7Graphics+R7200 series graphics'''
and other one R7 graphics as Linked.
*****This is the real configuration which will work great boosting performance to multiple times the before setup. (Example, if both your card has Memory bandwidth of 15GB/s each, then the Combined bandwidth will become 28GB/s for primary and 12-14GB/s extra from the Linked card will come up at the same time) Just imagine the boost it will give!
Remember, if you change the display from IGD to PCIe or vice-versa, screen will always go blank while booting after windows load. To fix or prevent this, always switch display port after uninstalling the AMD drivers, then after connecting display to the required port, reinstall AMD drivers..
PROOF: Need for Speed Rivals at 1440x900 resolution ultra settings worked at 5-7 FPS with the earlier setup while the same worked at 30-40 FPS with the proper setup.