What are you seeing for sia hashing for a 280x or 380x? Haven't seen anyone post what they are doing in Sia.
Dual mining with SIA and ETH.
My 380x are doing just under 300mh each while mining SIA over an extended period of time. Not simply going by what Claymore is reporting but by what the pool is reporting.
I only have one 280x and don't have enough data to show. Claymore is reporting 363 but I'm sure thats high. I'm sure that Nanopool won't see it as being that high

Or perhaps it is that high because I'm mining EXP on that unit instead of ETH. I get higher hashrates when mining EXP.