Generally, the more RAM, the better.
To build a PC, first put together a detailed list of components. Keep in mind that parts like the processor and motherboard must be compatible. You will find many choices when it comes to features and price. If money is not a concern, aim for the latest hardware. If you're on a budget, hardware that's of recent vintage, but not the newest version, costs much less yet still serves you well.
Case and Power Supply
A sturdy, roomy PC tower can be had for much less than $100. Cases with features such as colorful displays and transparent side panels are favorites among gamers and cost more. Common case types are the ATX mid-tower, ATX full tower, microATX and mini-tower. In choosing a case, consider the size of your motherboard and how much room you have for your PC, as well as the number of drive bays available. Choose a power supply from a major manufacturer, and check its dimensions to ensure it will fit in your case. It should be at least 500 watts, more if you are planning on installing a high-end graphics card. Often, selecting a case/power supply combo can lead to savings.
Motherboard and Processor
The motherboard plays a central role in determining the capabilities of your new system. Choose an Intel-based motherboard for Intel processors and an AMD-based model for AMD processors. Typically, the motherboard includes many essential features, such as a capable sound card, a network card, four or more USB 2.0 jacks, and on the latest models, some USB 3.0 jacks. Some motherboards include on-board graphics. The form factor, or size, of your motherboard must match the PC case. The most common form factors are ATX and the smaller microATX. Consider the number and type of expansion slots available on the motherboard. Select a multicore Intel or AMD processor. Many models and price points are available, some with up to six processing cores, as of 2011. Be certain that the socket type of the processor matches the socket type of the motherboard.
RAM, Hard Drive and Operating System
Select a sufficient amount of RAM, or random access memory, for your system. For most purposes, 4GB is enough, but 8GB is a good choice for demanding tasks. Be certain to choose a 64-bit operating system if you wish to install lots of RAM, since 32-bit systems cannot utilize much more than 3GB. If you have a Windows XP or Vista installation disc and product key, you may wish to use them to save money, but Windows 7 is a better choice to maximize your new system. Select a SATA hard drive of at least 500GB. If you will be storing significant amounts of video, choose a larger hard drive. Consider adding an external hard drive to back up your data.
Monitor, Keyboard, Mouse and Speakers
Monitor size is a matter of personal preference, but generally, a 20-inch or larger LCD is a good choice. When selecting a mouse and keyboard, consider whether you prefer wired or wireless models. Some monitors include speakers, but for the best sound, consider 5.1 or 7.1 surround-sound speakers.
Optical Drive and Optional Components
One of the least expensive components is a DVD drive that can read and write DVDs and CDs. Some movie enthusiasts prefer to add a drive that can read Blu-ray discs. For the best graphics, select an add-on video card. These can cost from $50 to $500, depending on specifications and capabilities.
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