need help to Finish my first Rig of 8 GPU titan x? (perhaps somthing is missing?)

[pay]

it is overkill if eventualy i go for the 980 gtx, if i do so i will cut down to 64 GB

if i go for titan X i will have (96gb of vram)

and i know exactly what a reffernce card are

http://www.evga.com/Products/Product.asp...P4-2992-KR titan x

http://www.evga.com/Products/Product.asp...P4-2982-KR 980 gtx

http://www.evga.com/Products/Product.asp...P4-4992-KR 980 TI