I'm in a similar situation where I have ordered 4x XFX RX470, 1x MSI RX470 and 1x 570, will try this pixel patcher and will let you know if I would be able to mine with this configuration.

I'm using Claymore only for Ethereum mining (not dual mining) but I get accepted shares rare, which factors affects the overall performance to get accepted shares.

My OS is Windows 10 64-Bit, and internet speed is 15Mbps stable, the graphic is MSI RX 470 Gaming and I'm planing to put in the upcoming days 4 more GPU XFX RX 470