^^ What he said.
IMO, don't use any beta bios's. "BETA" means "still in testing, not officially approved."
My DS3 came with F4 as well; flashed to F7 and am running perfectly.
If i were you, I would flash to F7 (many, many issues were fixed from F4 to F7) and WAIT to see what results others are having with the F8 bios first.
F7 is proven to be bug-free (for all intents and purposes), but most of all, STABLE.
Flash to F7 (make sure to select "load optimized settings" in the bios afterwards, THEN tweak it after a reboot) and be happy.