I don't know if it works with MOD bios. I don't mess around with that - maybe someone else knows. It works just fine with RX480's. Here's a picture of Claymore 11.1 linux on Ubuntu 16.04 LTS using 6 RX480's:
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did you ever tried Optiminer on Ubuntu 16.04? People get 280-290 H/s on RX480 AFTER fees, not before (what you are posting).
Small difference, but still.
You're right, what I am posting is before fees. 2% of 260 is 5, so after fees it would be about 255.
I have not tried Optiminer. Might have to do that. Depends on how well it works on Sapphire Nitro R9 fury. Since Ethereum looks like it is not going proof of stake in 2017 I'll probably swing my RX480's back to Ethereum and keep mining Zcash on R9 Fury cards.