I also suggest the Number1's CamDriver 3.04 is the best driver for all K790 users.
use it, its great. i loved it for the fact that now you can record videos at 21 fps instead of the stock 10/11 fps.

and as somebody said above, i agree there are so many acoustic drivers floating around the interwebs that its hard to decide which one's the best. acoustic drivers are hard to differentiate between caz human ear cant detect much difference when both the drivers have minimal quality difference.