Probably means PowerTune +10 instead of +20 (I think)
290's are a little weird to configure... one of my XFX's won't run on anything other than 947 (stock clock) lol... It also drops off BAMT 1.2 every once in a while, however, it doesn't affect shares so I don't really care.
well if you get bored and fancy fixing it, this is how to:
https://bitbucket.org/beebee/bamt/issue/2/gpus-drop-off-gpumon-and-web-interfaceTLDR: you need to edit /opt/bamt/common.pl (search for "regex"). Replace part of the regular expression that reads (\d)MHz with (.)MHz