A generic computer system is one not sold under a particular brand name, according to Northern Territory Consumer Affairs. They are generally similar to branded computers, but they have some advantages and disadvantages.
Generic computers are often cheaper than branded computers, but they might not come with a warranty or the promise of support.
Since computer parts are generally built to widely accepted specifications, some users design and build their own systems. Branded computer systems might use nonstandard parts that won't work with other components. For example, a branded computer might have its RAM soldered into place, making it difficult to upgrade or replace. Generic computers are generally easier to upgrade and modify.