Buying a DVI to VGA converter is more complex than it looks because not all DVI ports are the same. This guide will help you identify exactly what you need to avoid buying a cable that won't fit or won't work. 1. Identify Your DVI Port

Features only a flat horizontal pin with no pins around it . This port is digital-only. You must buy an active converter with a chip inside to transform the signal to analog VGA.

Features a flat horizontal pin surrounded by four small pins . This port supports both digital and analog signals. You can use a cheap, passive adapter.

These contain a conversion chip and usually cost $15–$40 . Use these for DVI-D ports (common on modern graphics cards). Some may require a USB power cable if the DVI port doesn't provide enough juice. 3. Key Features to Look For Go to product viewer dialog for this item. StarTech.com DVI-D to VGA Active Adapter Converter Cable

Before you buy, look at the back of your computer. The pin layout of your DVI port determines whether you need a cheap or a more expensive active converter .