That's impressive, but to erase any doubt, can you share your command line and what miner you are using right now to get that such hashrate without moding your bios, can't believe it dude. Since 2014 I've been in GPU mining but I never saw that kind of hashrate by factory bios of 570/580 8gb cards.
Claymore's miner injects timing straps at runtime ( in windows only ), so you do not need to bios mod anymore to get these results. They are pretty normal.