Is it possible?
I have Lenovo Y510P notebook with 2 GeForce GT750M GPUs installed. SLI setting in nVidia control panel is set to maximize 3D performance, so SLI is enabled I guess. But when I play HnH, only one of GPUs works. FPS is nice with just one GPU, but its quite hot, and I do not like making one GPU suffer when I have two.