What counts as a computer component?
A desktop computer is a collection of specialized parts that work as one system. The CPU executes instructions. The motherboard connects the platform. Memory holds active data. Storage keeps files when power is off. The graphics processor creates images, while the power supply and cooling system keep the hardware operating within electrical and thermal limits.
Cases, fans, network adapters, sound hardware and peripherals can affect usability too. The right choice depends on the job the machine needs to do, not on whether one model has the largest number in its product name.
Compatibility is the first buying filter
Before comparing benchmark charts, confirm that the hardware can physically and electrically work together. Check the processor socket, motherboard firmware, supported memory generation, case form factor, cooler clearance, graphics-card dimensions, storage interfaces and required power connectors.
Build for the workload you actually have
Gaming, office work, photo editing, software development, engineering applications and home servers stress different parts of a system. A gaming machine may justify more graphics performance, while large software builds or data-heavy applications can benefit from more CPU cores and memory. General office work is often better served by a balanced processor, adequate RAM and a responsive SSD than by an expensive graphics card.
If your goal is a new build or a targeted upgrade, the PC parts buying and upgrade guide turns those trade-offs into a practical decision process.