Good cards. But they draw 200-250w. The x11 kernal is not optimal. You should mine something else.
4 750ti's draw 260 watts.4 R9 Nano's draw 400 watt while doing 11Mhz..
And a 980ti does 13.5 mh/s at 310 watts at the wall..so about 240 watts.
I edited my post.. it's 11mhz per card.
Some extra info.
23,5Mhz @ 60Watt (core down to 850) per card on Ethereum, 25Mhz @ 100watt (stock clock) and 30Mhz @ 200watt (core @ 1100)
Don't think Nvidia can beat that ;-)
But pricy card none the less..
I have one single 970 card doing 7.3MH/s (X11), system is drawing 200W at the wall, 100W when idle.
ccminer 1.5.63 sp-mod. So both in terms of power usage and hashing power it beats 2 750 TIs, at least for X11.