fx8800p

Ok guys, so i just found a seller locally that selling an used lenovo y520 laptop with i7 7700hq and a gtx 1060 6gb ddr5 (as he said). But then when i ask him to send a photo of dxdiag, the displayed memory on the gtx 1060 shows only 1.9gb something ,maybe 2gb. So is it really a gtx 1060 or a...