I have, but not very much. Im not a massive overclocker, and lower noise is more important to me. There really isn't any games I play, where I feel I need too overclock it.
If overclocking is the most important thing for you, then Gigabyte seems to be the option. But I can get back to you when I receive my MSI 970. Can do some comparisons.
But the Strix is lovely quiet.