Asus AMD Radeon R9 280X 3GB GDDR5 2DVI/4DisplayPort PCI-Express Video Card (R9280X-DC2T-3GD5-V2) Chipset: AMD Radeon R9 280X Engine Clock: 1070 MHz Video Memory: 3GB GDDR5 Memory Clock: 6000 MHz (1500 MHz GDDR5 ) Memory Interface: 384-bit