Sometimes enough, sometimes not (especially if the card is one and the same desktop on it)
You can try a different currency with Etash algo which less epoch. Expanse for ex.

And redownload v1.9 slightly faster.

GTX660 -exp1 -int 20 -wsz 128   no overclocking - 11,5MX/c
GTX660 -exp1 -int 20 -wsz 128  Core+80, Memory +150, 12+MX/c

GTX1060 3GB (Palit, Inno)  -exp0 -int 20 -wsz 64 Memory +500, Power Limit  75% - 20,5MX/c
GTX1060 3GB (Palit, Inno)  -exp0 -int 20 -wsz 64 Memory +700, Power Limit  100% - 21,5MX/c