I have XFX RX480's hooked up to a MSI Z170a gaming m5.

The first GPU has a memory issue.

http://gpuz.techpowerup.com/17/04/20/tp9.png

All the other cards are stable at:

http://gpuz.techpowerup.com/17/04/20/4s3.png

It's causing a small decrease in hr: 2-4% on zec other cards are running
307-311 h/s and this one running 274-298 h/s.

Any help greatly appreciated.