Download MSI Afterburner and install it.
Open afterburner.cfg in notepad, and where it says “Enable Unofficial Overclocking EULA =”, and paste this
I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
Enable Unofficial Overclocking from 0 to 1.
Save and close. Restart MSI afterburner and change your memory clock to its minimum, where the memory clock should be 1/3 of your core clock.
Comment with what clock speeds you use for your cards and your hashrate (maybe your OS, driver version, and miner/version).
(Original post from BitCoinPool’s forum post here