i tried bamt because of win 7 is supporting only 4 gpu's.

But BAMT dit only activate the card connected to the monitor. All the other cards did not work. And unfortunatly you cant use a dummy plug.

I cant solve this problem. Maybe you have more luck or experience with linux.

Please post your experience.

In the end i use win 8 and its fine.

I use afterburner for undervolting.