Computer vs 4k

Solution
PCPartPicker part list: http://pcpartpicker.com/p/GRkMMp
Price breakdown by merchant: http://pcpartpicker.com/p/GRkMMp/by_merchant/

CPU: Intel Core i7-4820K 3.7GHz Quad-Core Processor ($319.98 @ OutletPC)
CPU Cooler: Corsair H60 54.0 CFM Liquid CPU Cooler ($64.99 @ Newegg)
Motherboard: Gigabyte GA-X79-UD3 ATX LGA2011 Motherboard ($219.99 @ SuperBiiz)
Memory: A-Data XPG V2 16GB (2 x 8GB) DDR3-2400 Memory ($152.99 @ Newegg)
Storage: Sandisk Ultra Plus 128GB 2.5" Solid State Drive ($59.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
Video Card: Asus GeForce GTX 780 Ti 3GB DirectCU II Video Card ($599.99 @ NCIX US)
Case: Apex SK-393-C ATX Mid Tower Case ($25.97 @ NCIX US)...
PCPartPicker part list: http://pcpartpicker.com/p/GRkMMp
Price breakdown by merchant: http://pcpartpicker.com/p/GRkMMp/by_merchant/

CPU: Intel Core i7-4820K 3.7GHz Quad-Core Processor ($319.98 @ OutletPC)
CPU Cooler: Corsair H60 54.0 CFM Liquid CPU Cooler ($64.99 @ Newegg)
Motherboard: Gigabyte GA-X79-UD3 ATX LGA2011 Motherboard ($219.99 @ SuperBiiz)
Memory: A-Data XPG V2 16GB (2 x 8GB) DDR3-2400 Memory ($152.99 @ Newegg)
Storage: Sandisk Ultra Plus 128GB 2.5" Solid State Drive ($59.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
Video Card: Asus GeForce GTX 780 Ti 3GB DirectCU II Video Card ($599.99 @ NCIX US)
Case: Apex SK-393-C ATX Mid Tower Case ($25.97 @ NCIX US)
Power Supply: XFX ProSeries 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.99 @ NCIX US)
Optical Drive: Lite-On iHAS124-14 DVD/CD Writer ($13.99 @ Newegg)
Sound Card: Diamond XtremeSound XS51 16-bit 48 KHz Sound Card ($9.99 @ Micro Center)
Case Fan: Cooler Master SickleFlow 69.7 CFM 120mm Fan ($2.99 @ Newegg)
Case Fan: Cooler Master SickleFlow 69.7 CFM 120mm Fan ($2.99 @ Newegg)
Case Fan: Cooler Master SickleFlow 69.7 CFM 120mm Fan ($2.99 @ Newegg)
Case Fan: Cooler Master SickleFlow 69.7 CFM 120mm Fan ($2.99 @ Newegg)
Case Fan: Apevia CF4S-BK 25.6 CFM 80mm Fan ($2.07 @ Newegg)
Case Fan: Linkworld FAN-9 34.0 CFM 90mm Fan ($2.99 @ Newegg)
Case Fan: Linkworld FAN-9 34.0 CFM 90mm Fan ($2.99 @ Newegg)
Case Fan: Linkworld FAN-9 34.0 CFM 90mm Fan ($2.99 @ Newegg)
Case Fan: Linkworld FAN-9 34.0 CFM 90mm Fan ($2.99 @ Newegg)
Case Fan: Linkworld FAN-9 34.0 CFM 90mm Fan ($2.99 @ Newegg)
Fan Controller: Aerocool F6XT Fan Controller ($15.99 @ Amazon)
Fan Controller: Aerocool F6XT Fan Controller ($15.99 @ Amazon)
Total: $1665.81

This is better. Maybe 35FPS with 4K
 
Solution
That original build wont get anywhere near playable FPS on 4k. The 2GB of vram will be limiting, even more so in SLI on a 760.
A 780Ti/R9 290x will run ultra 4k no AA at 26-30 FPS. 780Ti SLI and 290x Xfire will get closer to 60, but wont hit 60.