Will this work

[numicancu]

Mother board: Gigabyte X99-UD3P
Cpu: intel i7-6800K
GPU: Asus Geforce GTX980Ti DC3 Strix Gaming Edition (6GB DDR5)
Ram: G.Skill Ripjaw4 16GB. (2x8GB) ddr4
SSD:Samsung 850 EVO M.2 MZ-N5E250BW (250Gb)
Main Hard Disc: 1Tb WD Black
PSU: EVGA Super Nova 850G2 80 plus Gold
CPU cooler: Corsair Hydro Series H100i v2 Extreme Performance Liquid CPU Cooler
Optical: HP External DVD drive A2U56AA
Case:Cooler Master -MasterCase pro5

 

[Isokolon]

Should work fine.
But I'd go with a GTX1070 instead of the 980Ti
The PSU might be a bit overkill if you're not planning on going SLI