another +1 from me... I switched rig#1 to ETH 3 days ago and rig #2 (5x RX 470's) to XMR 2 days ago.  As it is, XMR is more profitable than ZEC... by almost 2x for me... but it does seem that this GPU miner was written before the advent of the RX-400 series cards, so hoping there is room for some improvement for them. Personally, I would be willing to pay a higher fee for a newer version of this that optimized 470's better.

Also, can anyone recommend the best settings for 470's in this miner?  At default settings, I am only getting 2,880 for 5 GPUs (about 575/GPU).  maybe using -a 1 or -a 2 will increase their speed/efficiency?  what about the -h settings for 470s?  Any recommendations?

I am running 4 MSI 470 4GB and 1 Sapphire Nitro 470 8GB on this rig.  Is it fair to say that I could probably push that nitro a lot further using this algo since it has twice the memory?  Or, is that not a huge factor for this algo?