Higher clocked GeForce GT 640 with GDDR5 memory. Vlask's card:OC model with higher clocked core at 1137MHz. Asus GTX650-DCO-1GD5Asus GTX650-DCO-1GD5 Asus GTX650-DCO-1GD5Asus GTX650-DCO-1GD5 GeForce GTX 650 GPUZGeForce GTX 650 GPUZ GeForce GTX 650 GPGPUGeForce GTX 650 GPGPU