ETH launch + couple of months they were doing 10-11MH oc'd, after that windows users started to have some performance issues but linux gave some overtime. I sold them when the dag size kept growing and they started to struggle in linux too so no idea what they can do today, pretty sure they can run cryptonight 250-350 h/s today.
That card is a mining legend, it was (and still is) profitable when amd's went negative. After 3,5 years street price is still 50% of the launch price, that's something no high end card can do.
That's pretty high and far beyond my expectation. It's certain that the performance would be pretty bad by now, but I don't really know how bad it is. Maybe I should bench them myself lel.
But if they can do that much on low-dag Ethash coins, I would really want to get more of them to build a 6-gpu rig. And yes I've seen lots of people have performance issue, but I think that's the same case when I firstly mine with 970. They do better in linux and compatible driver version for windows.