Form factor describes the standardised dimensions and shape of a piece of hardware. It's a critical spec because it affects what you can actually fit into your computer, monitor stand, or shelf.
Common examples include:
- PC cases: ATX (standard desktop), Micro-ATX (smaller), Mini-ITX (tiny), and E-ATX (larger).
- Storage drives: 3.5-inch (traditional desktop hard drives), 2.5-inch (laptop drives and SSDs), M.2 (slim NVMe drives).
- Laptops: Ultrabook, convertible, gaming laptop, and business clamshell all have different dimensions and weights.
- Graphics cards: Full-length, half-length, or low-profile to fit in compact builds.
- Monitors: Measured diagonally in inches and categorised by aspect ratio (16:9, 16:10, ultrawide).
When you're shopping for hardware, the form factor matters more than specs alone. A powerful graphics card is useless if it doesn't fit in your case. A high-end processor needs a compatible motherboard with the right socket. A monitor must fit your desk or monitor arm. Always check the physical dimensions and compatibility before buying. Manufacturers list form factor in the product specs, and it's often a dealbreaker if you ignore it.