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
Updating, my situation is like below.
I have 6 GPUs but they are not working all together, I have tested one by one and all of them are working even though I had to re-install driver and put that patch in order to work correctly (after reboot) but when I put all together I get Code 43 which is not accepting more than 2 or sometime 3 GPUs.
I have 4x XFS RX 470 and when I put together only 3 works good and one has only 4Mh/s where could be the issue?
I'm getting 22 Mh/s in XFS 470 and 24Mhs in MSI Gaming 470, both unmodified bios until I resolve the issues with drivers !!!