Lutfij :
For 1080p gaming you should be fine however the primary concern from your GPU upgrade would be, if the PSU can handle the GPU upgrade. Mind sharing your full system's specs?
Case- Corsair Carbide Series 500R white steel
Power Supply-Corsair Enthusiast Series 650-Watt
Mainboard- MSI Z77 A-GD65 LGA 1155 Intel
CPU-Intel Core i5-3570K Quad-Core Processor 3.4 GHz 4 Core LGA 1155
Cooling- cooler master 212 Plus
Videocard- MSI R7950 Twin Frozr 3GD5/OC Radeon HD 7950 3gb
Ram-Corsair Vengeance 8GB 240Pin DDr3
Am also planning on upgrading to 165hz Monitor, in the future im planning on upgrading motherboard cpu and ram.