I didn't choose Beam for the GPUs to mine, that's the only option I get. I'll look again for the Kapow benchmark in Nicehash. And yes I do use the Nicehash mining client on all 3 PCs.
Kawpow algorithm is more profitable on nvidia cards right now and also look into conflux, it's a coin running on octopus algorithm, it's far more profitable than even kawpow algorithm