Hello ! I have a mine on the old r9 290 and r9 290x cards, can you tell me if you can apply it - strap to them?
I have a few of these GPUs also and you pretty much shouldn't mine ETH with them due to a DAG thrashing bug which is causing slowdowns.
Basically 1.5 years ago, I was able to mine ETH at 30MH/s with the R9 290 reference GPU however all of a sudden over a certain DAG it started to slowdown, it kept slowing down with every new DAG until eventually I stopped using them all together. The speed was slow and the power consumption was the same.
It has the same issue as the R9 280X which caused the GPUs to go from 28MH/s (DAG #0) to like 7MH/s with the latest DAG and pretty much rendered the GPUs useless for mining.