The hardware components that comprise a typical server computer are similar in type but higher-grade to the components used in less expensive client computers. The following paragraphs describe the typical components of a server computer:
Motherboard: The motherboard is the computer’s main electronic circuit board to which all the other components of your computer are connected. More than any other component, the motherboard is the computer. All other components attach to the motherboard.
The major components on the motherboard include the processor (or CPU), supporting circuitry called the chipset, memory, expansion slots, a standard IDE hard drive controller, and I/O ports for devices such as keyboards, mice, and printers. Some motherboards also include additional built-in features such as a graphic adapter, SCSI disk controller, or network interface.
Processor: The processor, or CPU, is the brain of the computer. Although the processor isn’t the only component that affects overall system performance, it’s the one that most people think of first when deciding what type of server to purchase.
Each motherboard is designed to support a particular type of processor. CPUs come in two basic mounting styles: slot or socket. However, you can choose from several types of slots and sockets, so you have to make sure that the motherboard supports the specific slot or socket style used by the CPU. Some server motherboards have two or more slots or sockets to hold two or more CPUs.
The term clock speed refers to how fast the basic clock that drives the processor’s operation ticks. In theory, the faster the clock speed, the faster the processor. However, clock speed alone is reliable only for comparing processors within the same family. In fact, because the Itanium processors have more advanced circuitry, they are faster than Xeon processors at the same clock speed.
The number of processor cores also has a dramatic effect on performance. Each processor core acts as if it's a separate processor. Most server computers use dual-core (two processor cores) or quad-core (four cores) chips.
| Processor | Clock Speed | Processor Cores |
|---|---|---|
| Itanium 9300 | 1.60–1.73GHz | 4 |
| Xeon | 1.83–3.4GHz | 2–6 |
Memory: Many different types of memory are available, so you have to pick the right type of memory to match the memory supported by your motherboard. The total memory capacity of the server depends on the motherboard. Most new servers can support at least 16GB of memory, and some can handle up to 256GB.
Hard drives: Most desktop computers use inexpensive hard drives called SATA drives. These drives are adequate for individual users, but because performance is more important for servers, another type of drive known as SCSI is usually used instead. For the best performance, use the SCSI drives along with a high-performance SCSI controller card.
Network connection: The network connection is one of the most important parts of any server. Many servers have network adapters built into the motherboard. If your server isn’t equipped as such, you’ll need to add a separate network adapter card.
Video: Fancy graphics aren’t that important for a server computer. You can equip your servers with inexpensive generic video cards and monitors without affecting network performance.
Power supply: Because a server usually has more devices than a typical desktop computer, it requires a larger power supply (typically 300 watts). If the server houses a large number of hard drives, it may require an even larger power supply.
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Source:http://www.dummies.com/how-to/content/network-basics-server-computer-components.html
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