loqakam1 :
I was going to buy 4x 750k with gtx 760 or r9 270x then later sli or cf it,i'm on budget, for gaming play bf4 and bf3 and other games,and 1080p i won't go higher than that,
You'll only gain pure FPS from SLI/CF so it's your chose in the future. Some games can be unoptimized for SLI and have microstuttering or won't work at all and you have to also consider the heat generated by each card. You would be better off getting 1 top end card such as a 780 and wait for the price to drop so you can do SLI in the future. Consider these two CPUs for SLI/CF:
www.pcpartpicker.com/part/amd-cpu-fd6350frhkbox
www.pcpartpicker.com/part/amd-cpu-fd8350frhkbox
780s:
www.pcpartpicker.com/parts/video-card/#c=136&sort=d4&m=8,14,18,27