4K Gaming

You could've kept this in your original post, but no bg deal.

Here's a build to consider. 

Doesn't have to be the same brand card, but the clock speeds will be the lowest of the two.

Configuration Code: 1608102
Total Price with Instant Savings: $2,770.00

Direct Load URL: https://www.digitalstorm.com/configurator.asp?id=1608102

Specifications:
Chassis Model: Special Deal Hot Seller - Digital Storm Velox
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i7-7700K 4.2 GHz (Codename Kaby Lake) (Unlocked CPU) (Quad Core)
Motherboard: ASUS ROG Strix Z270H GAMING (Intel Z270 Chipset) (Up to 3x PCI-E Devices) <br><strong></strong>
System Memory: 16GB DDR4 2666MHz Digital Storm Performance Series
Power Supply: 850W EVGA SuperNOVA <br><strong></strong>
Expansion Bay: Option Not Available
Optical Drive: DVD-R/RW/CD-R/RW (DVD Writer 8x / CD-Writer 8x) (Internal)
Storage Set 1: 1x SSD (480GB Digital Storm Performance Series)
Storage Set 2: 1x Storage (1TB Western Digital - Black Edition) <br><strong></strong>
Storage Set 3: - No Thanks
RAID Config: - No Thanks
RAID Card: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Graphics Card(s): 1x GeForce GTX 1080 8GB (Performance Edition) (VR Ready) <br><strong></strong>
Sound Card: Integrated Motherboard Audio
HPC Processor: - No Thanks
Extreme Cooling: H20: Stage 2: Corsair H115i - 280mm Liquid CPU Cooler (Fully Sealed + No Maintenance) <br><strong></strong>
HydroLux Tubing Style: - Not Applicable, I do not have a custom HydroLux liquid cooling system selected
HydroLux Fluid Color: - Not Applicable, I do not have a custom HydroLux liquid cooling system selected
Cable Management: Premium Cable Management (Strategically Routed & Organized for Airflow)
Chassis Fans: Standard Factory Chassis Fans
Internal Lighting: Remote Controlled LED Lighting System (Multiple color options and lighting effects) <br><strong></strong>
Airflow Control: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
LaserMark: - No Thanks
Boost Processor: Stage 3: Overclock CPU - Up to 5.0GHz (Depends on Cooling and Motherboard) <br><strong></strong>
Boost Graphics Card(s): - No Thanks, Please do not overclock my video card(s)
Boost OS: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows 10 Home (64-Bit Edition)
Recovery Tools: Factory Reset Feature (Restore Windows + Drivers) (Partition up to 50GB of Storage)
Virus Protection: FREE: McAfee AntiVirus Plus (1 Year Service Activation Card) (Not Pre-installed) ($35 Value)
Office: - No Thanks
Game: - No Thanks
Display: - No Thanks
Surge Shield: - No Thanks
Speakers: - No Thanks
Keyboard: - No Thanks
Mouse: - No Thanks
Branded Gear: - No Thanks
Priority Build: - No Thanks, Ship Within 15-20 Business Days After Order Is Successfully Processed
Warranty: Life-time Expert Care with 3 Year Limited Warranty (3 Year Labor & 1 Year Part Replacement)

Hope this helps.

Without sli in the build , DS probably wouldn't include the HB bridge but mention it in the comments section at bottom of configuration.   They might charge but not sure.