The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do. -Ted Nelson
Our custom-built computers are quite capable of handling well over 90% of the games out now. With the right kind of further upgrade, such as a more powerful processor, video card or even hard drive, you can enjoy any game that is published for computer play. These computers, whether socket 775, 1155, or other, can easily be used for multi-tasking office work, compiling, game playing or other tasks.
(Taken from Wikipedia) Most mainstream manufactured computers use common or inexpensive parts such as onboard graphics and audio. While integrated accessories offer dramatic economic savings (and satisfy many users), these options generally do not perform as well as dedicated hardware under high demand situations such as current games and CAD. Additionally, those with more specific computer needs usually appreciate being able to upgrade certain components to fit their needs and the evolving needs of the software being used; in a typical manufactured PC the support components (such as power supply unit, motherboard, or even the chassis) are unfit for accepting high-performance add-in components. Constructing a system with future expansion in mind allows for such upgrades, which in turn are much cheaper than buying a brand new computer every time individual components become obsolete or insufficient to meet the needs of the user.
High-end PCs most often fall in the realm of heavy processor and/or memory usage applications such as a multimedia PC, home theatre PC, music production, engineering, and many more. Generally a high-end system is capable of meeting the demands of gaming and can be used as such. A major difference between a high-end PC and a gaming PC is likely to only be the choice in video card since they will share a majority of other components. While a general-purpose high-end computer may be put to use as a file server, and be provisioned with components targeted at this use (such as a fast GPU for rendering or high-performance storage for serving files), most gaming takes place in real time, so with a gaming PC all the components matter in creating a flawless and seamless experience. A less-intensive type of build satisfies or exceeds the needs of most computer users.