How did you get your memclock < 710? Did you bios flash?
No, Just used MSI Afterburner.
I don't think it works anymore, I changed to mode=2, moved the slider all the way down to 340, saved, closed, reopened and the slider was still all the way down to 340
Close it and delete the 3 .cfg files that start with VEN at this location. \MSI Afterburner\Profiles\
When you start it again and it asks you to reboot just hit no.