Hi,
If you can I would return the two 1080's and get a single 1080 Ti. Many games have problems/don't support dual cards. As well, the 4 thread i5 will likely bottleneck dual 1080's
https://www.techpowerup.com/forums/threads/which-cpu-to-buy-for-gtx-1080-sli-build.229640/
But if you can't here is a build
PCPartPicker part list:
https://de.pcpartpicker.com/list/WDN9LD
Price breakdown by merchant: https://de.pcpartpicker.com/list/WDN9LD/by_merchant/
CPU: Intel - Core i5-7600K 3.8GHz Quad-Core Processor (Purchased For €0.00)
CPU Cooler: Deepcool - GAMMAXX 400 74.3 CFM CPU Cooler (€29.99 @ Amazon Deutschland)
Motherboard: ASRock - Fatal1ty Z270 Gaming K6 ATX LGA1151 Motherboard (€196.26 @ Mindfactory)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3000 Memory (€132.99 @ Amazon Deutschland)
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive (€97.99 @ Amazon Deutschland)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (€50.50 @ Amazon Deutschland)
Video Card: MSI - GeForce GTX 1080 8GB GAMING X 8G Video Card (2-Way SLI) (Purchased For €0.00)
Video Card: MSI - GeForce GTX 1080 8GB GAMING X 8G Video Card (2-Way SLI) (Purchased For €0.00)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case (€87.84 @ Mindfactory)
Power Supply: EVGA - SuperNOVA G3 850W 80+ Gold Certified Fully-Modular ATX Power Supply (€145.84 @ Mindfactory)
Total: €741.41
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-08 13:18 CEST+0200