Got a few mining GPU mining rigs with dual R 280/290x cards. I haven't mined anything since LTC and was wondering if there is a coin I can mine profitably, what algo etc?
I have been mining with GPUs until a few days ago.
Had the same questions. Unfortunately I started to sell them off. Even though I have free electricity. Switching over to SHA256 Asics. In my opinion it's better at the moment and you will have soon to expect that the r9s will fall deeper in value because of AMDs successor models coming in Q2.
See it more as a hobby I would say. But if you even have to pay for electricity, you will likely not get anything much there anymore.
Btw. I had 6x r9 280x and 3x r9 290. The most fun was starting with coin launches and so on, but these have gone as many scamcoins launched.
Nicehash is at the moment the most uncomplicated method, if you just want to point and let them run. The daily stats can vary greatly, but with multialgomining and swtting X11, x13 and x15 (which dont use as much energy as the other algos) you can still get the most out of them.