Yep, it's true: 175-180 h/s. And no mods, only overclocking (1180/1500 for me).
BUT, there is a downfall:
ETH mining, v 7.3 - 845W from the wall on 4x280x
ZEC mining, v 7.0 - 915W!!!
mod your bios. can probably reduce power consumption.
https://bitcointalk.org/index.php?topic=1676474.0