Looks like the XMR fork is coming soon. About 3 weeks or so. And it doesn't look like Claymore will be updating his software to support the new algo.
Any miners out there that are stable for the AMD RX series and maybe the old Litecoin era GPUs like R9 280X/Radeon 7970 ?
XMR-STAK?
When I tried that program in the past, my speeds were much much slower than Claymore and if I added more threads it basically ended up in an instant freeze.
It seems to work better for newer GPUs but seems unstable for the older GPUs. Maybe will see if there is a newer version that is more stable.
As for now XMR-STAK 2.4.7 is a bit faster for Antilles GPU then the last Claymore that was compatible (9.7, now obsolete). But it really need fine-tuning and proper driver selection cause latest drivers for Antilles (15.7) do not report proper memory size. The problem was discussed in deep at XMR-STAK github
https://github.com/fireice-uk/xmr-stak/issues/472. In short you have to use 14.4 driver for optimal performance. Please note that it is impossible to use HD69xx and RX in a single system with optimal performance.