A very weird thing is happening with my RX 480 8GB. Overclocking memory gives me this:

Setting DAG epoch #201 for GPU0
Create GPU buffer for GPU0

And then reporting continuously 0.000 Mh/s. Any alteration to -mclock other than the value 2000, which is what the default clock is set to, will cause 0.000 Mh/s.

I have 5 other RX 580 cards running just fine on the same rig. Ample amount of virtual memory. I don't use any software. I use Claymore to apply overclocks. When I set the memory to 2000 it runs at 29.6 Mh/s without problem which fine but it has samsung memory and I'd like to try see what it can do. BIOS is unchanged except for memory straps.