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Yeah they're very good! I bought both my 280x's for $50 each and with 230H/s they have a ROI of ~~40 days (electricity excluded)

Has the hash rate for 280X increased durinf the past year? I tried mining with mine in January 2018 and get ~280h/s on Equihash. Settings is -20% power limit, 1000Mhz core, 1500Mhz memory.

Hello, yes kind of. The miners are better now which gives you more hashrate:)