Thanks Buddy, for X11 i think we use SGMiner? I was unable to configure SGminer with my pool - Xhash.net to mine DRK coin. Think i should ask about this one on the appropriate forum. BTW if you can PM the settings for using SGminer (if you have them), i would be obliged.
For X11 on nvidia cards you have to use ccminer. Which this thread is about.