A common point of confusion for vintage tech enthusiasts is finding the exact model number. Sony laptops typically feature a on the bottom casing sticker (such as PCG-3J1M or PCG-81313M ). However, the official marketing and support name—which you need to download original drivers—is usually found on the screen bezel or via the system BIOS (e.g., VGN-FW54M ). The specifications listed below correspond directly to the internal hardware configuration of this specific hardware platform. Core Hardware Specifications Sony Vaio PCG-3F1M VGN-FW31ZJ - 1527246 - Furbify