Ah, sorry, I know what the problem is. Unfortunately Octane version 1.2 does not support Maxwell cards (compute 5.0 and above I think). You will need to upgrade to version 2 to use the 970s.
hi all, just to confirm, Octane v1.2 is a legacy version (June 2013) it does not support Maxwell cards that we're first released in Feb 2014. Support for Maxwell cards in Octane were introduced in Octane v1.54 (May 2014). cheers...