Hashcat only using one gpu

Alright so having a problem with hashcat only utilizing one graphics card sometimes it uses gpu0 sometimes gpu1 seems to pick one at random each time hashcat is loaded.

I have tried re-installing nvidia drivers (347.52) with perform clean install checked also tried hashcat versions 1.33, 1.32, 1.31 with same results so clearly its a problem on my end any suggestions?

http://i.imgur.com/rjgcvsR.png

Thanks