I am running a rig right now with 2 cards in it. AN XFX RX 570 8G and an XFX RX 570 4G

The 8G card is running around 22 MH/s
The 4G card is running either 0 MH/s or 0.651 MH/s on Pheonix 5.3b and 5.4c

My bat file is the one that came with the download, I just changed the wallet address for the start miner file

What can I do to get the second card (4G one) to get a decent hashrate on the miner?