Gigabyte Graphics Card

I want to sell my graphics card of Gugabyte and the model no is GV-N770OC-4GD. I didn't use it for a single day and it has it's warranty of approx 7 or 8 months as i got 2 sets of this version/model. can provide you the money reciept. the specifications are given below:Chipset
Memory Clock 7010 MHz
Process Technology 28 nm
Memory Size 4096 MB
Memory Bus 256 bit
Core Clock Base / Boost clock：1137 / 1189 MHz
Card Bus PCI-E 3.0
Memory Type GDDR5
DirectX 11.2
OpenGL 4.4
PCB Form ATX
Digital max resolution 4096 X 2160(via a single HDMI connector and not supported with two DVI connectors)
Analog max resolution 2048 x 1536
Multi-view 4
I/O Dual-link DVI-I*1
DVI-D*1
DisplayPort*1
HDMI*1
Card size L=292mm W=129mm H=43mm
Power requirement 600W (with one 6-pin and one 8-pin external power connectors)
please only real buyer call me on this number(01620708048) and the price is slightly negotiable
TIA
Regards!