Thanks to C&C, Nvidia now about rules X11 and related coins. As for the cards, 750ti's are popular, might want to try those. Or 780(ti)'s.
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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.