https://forum.litecoin.net/index.php/topic,2641.0.htmlApparently the Gigabyte Windforce's do well, the guy who started that thread also mentioned in a different thread that he was able to get up to about 670 or 680 with his and that someone else on a different forum had broken 700 KHash/s. Even though they are voltage locked apparently you can flash a different bios to unlock them.