not enough RAM no doubt
4GB should be enough.
... please explain why its not.
Are you seeing temperatures in cgminer? If not your cards are likely not using any of your clock settings you are asking for. I'd imagine your hashrate would be right about where it is now, on stock clocks.
Try mining locally, with a display.
Temperatures are 'normal' also tried mining with monitor attached, nor difference...screenshot is from putty.
http://image-upload.de/image/q7JIuO/595e1a564d.pngFWIW I still have this problem with my 280x cards in xubuntu, I can not start mining over ssh/putty.
Did you follow the same guide by cryptobadger?
