No problem with how much performance actually?
You not only need to have a GPU running. The problem that next to all miners get is huge performance penalty with xmr-stak, up to 80% of hashrate loss. Please post more details about your performance results both with CCNM 9.7 and XMR-STAK
Also please elaborate on stability issue. When using 15.12 drivers I have frequent issues with tempereture sensors that stop reporting until hard reboot.