So I just picked up this laptop and I was wondering if I could upgrade the graphics card in it?
AMD Phenom II X4 Quad-Core N970 processor
2.2GHz, 2MB L2 Cache
4GB DDR3 SDRAM system memory (expandable to 8GB)
500GB SATA hard drive
8x SuperMulti DVD Double-Layer Drive
17.3" HD+ widescreen CineCrystal display
ATI Radeon HD 4250 Graphics with 256MB of dedicated video memory and support for Microsoft DirectX 10.1
iI HAVE AN ACER ASPIRE 7551-3749 WITH ATI 4250 & 256 MB VIDEO MEMORY BUT I HAVE AN OPEN EXPANSION SLOT FOR ANOTHER VIDEO CARD. I JUST DO NOT KNOW WHERE TO PURCHASE ONE. PLEASE RESPOND.