I get a consistent ~302 H/s out of my 2GB Asus OC Edition RX-460s.  I'm actually quite happy with these cards, despite the bad name they get from some ranting online idiots who expect more out of them than they are intended to provide.

In contrast, I have a 4GB XFX RS RX-480 that only manages a disappointing ~580 H/s for double the price and power consumption.

These are totally stock, no custom firmware or undervolt / overclock.  Running wolf-xmr-miner with optimized configs on Ubuntu Server 16.04.