I got 2 extra mboard. both are only 4 slot available (1x and 16x).
what gpu I need to buy for x11 coin?
what psu I need to buy also?
one mb w/ i7 2700k cpu and other is 1150 socket w/o cpu.
what do u guys recommend me?
I'd recommend the Nvidia 750Ti card for x11 mining. I've seen reports of 2+Mh/s on those cards and their power consumption is way lower than anything AMD.
For PSU I always go for Seasonic brand, gold or platinum certified for efficiency. Not sure on the power usage of the 750Ti's on x11 though, so I can't recommend anything specific.