I haven't used Nicehash. Is CCminer compatible for X11?
Yes, i'm using it as a failover pool (with pfool stratum proxy).
Failover? How can we set failover in CCminer?
It isn't set in CCminer, but on the stratum proxy. All my miner (a 780ti and a 770) are pointing to my stratum proxy and the proxy is automatically switching from one pool to another using the right username/password for each.
Here is an exemple of my hashrates for the 3 pools I have set.
http://tof.canardpc.com/view/17c80629-c30d-4494-b115-17066bdbbbe0.jpg