The ASUS ROG Strix GeForce GTX 1070 8GB represents not an evolution in GPU's but a revolution in GPU's and you should consider jumping to the Pascal core for VR and $k gaming future proofing.
Sheer Power; Direct CU III Cooling; GDDR5 at a 8000MHz effective; 7.2 Billion Transistors On A 314mm2 Die; 16nm FinFet Process; Overclocking Ease; RGB; Auto Extreme Manufacturing; More Wallet Friendly Than GTX 1080
Size Impedes Using Smaller Cases