2 Monitor with Radeon HD7660D and GeForce GT730in Multi GPU Mode FPS

Hi,

i have a game with 2 monitors. in the old configuration there was simple an internal graphic card (Radeon 7660D) with dvi and hdmi and both monitor connected. the fps was 80.

the new configuration is the same hardware (Radeon 7660D) but a second graphic card (GeForce gt730) for multi gpu.

in the bios multi gpu is enabled and the device manager shows both grafic cards. But when i now start the game i have unbelievable 30 fps . why i have not minimum the same fps? Both Monitor works like before but with a terrible fps.

The System is Windows 10 Prof and the Unity Version is 5.3.4.

Is there a opportunity to work both graphic cards together?

thank you in advance

P.S. The first Monitor is for the game, the second for the points display (implemented with 2 cameras)