PepitoTV :
Then the more powerful option is the 280x crossfire, assuming the rest of your system can cope with it.
You decide you think it can
CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler
Motherboard: Asus Maximus VI Extreme ATX LGA1150 Motherboard
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk
Storage: Samsung Spinpoint M8 1TB 2.5" 5400RPM Internal Hard Drive
Case: Cooler Master Storm Trooper ATX Full Tower Case
Power Supply: Corsair RM 1000W