Sony Vaio VGN-F VGN-NR Series Intel Socket 478 Laptop Motherboard A1727021A A-1727-021-A.Sony Part Number: A1727021A A-1727-021-AModel Number: MBX-189Compatible Part Numbers: A1727021B A-1727-021-BCompatible Models: Sony Vaio VGN-F VGN-NR Series