Build your computer around DDR3 RAM

DDR3 RAM is one of the fastest mainstream memory types currently on the market. While DDR2 RAM can often get the job done on most desktops, a system builder hoping to create a high-performance or long-lasting rig would do well to consider DDR3 RAM because it offers fast timings and significant power potential.
DDR3 RAM typically comes in a number of packages, with the first number representing the number of memory sticks in the bundle, and the second declaring the power of each stick. Typical bundles include 1X2 GB, 2X2 GB and 3X2 GB. DDR3 speeds range as high as 2,500 Mhz, but 1,333, 1,600 and 1,860 Mhz models are also popular and quite fast. In comparison, the fastest DDR2 memory sticks max out at around 1,200 Mhz.
All of this power, however, can be nullified if the system surrounding your RAM is inferior or incapable of handling high speeds. The motherboard and processor are especially important when choosing RAM.
The motherboard is probably the most difficult to match with your RAM. Each motherboard is only capable of working with RAM of certain varieties and at certain speeds. For example, a motherboard may only support DDR2 RAM with speeds as high as 1,066 Mhz. Likewise, a motherboard supporting DDR3 Memory may max out at 1,333 Mhz. This does not always mean that DDR3 memory with timings faster than 1,333 Mhz will not work with that motherboard. Instead, the RAM will not get enough voltage to run at 1,333 Mhz, and may default to slower timings.
One way to overcome this barrier is to consider overclocking. Experienced system builders will often take components and manually adjust the maximum voltages that can be sent into them from the power supply. This can be risky because it negates the system's inherent safeguards, but it can also boost performance. In many cases, experienced overclockers can provide a significant upgrade to a component without risking stability.
Another important consideration when choosing a motherboard for your DDR3 RAM should be the number of and types of memory slots. Almost all DDR3 RAM uses a 240 PIN connection to plug into the memory slot. As a result, you should ensure the motherboard's memory slots are 240 PIN.
The other key issue when considering your motherboard is the number of memory slots. Most motherboards designed to support DDR 3 memory will come with three or more memory slots. With three plugs, a set of 3X2 GB RAM will fill all three slots and provide 6 GB of memory. Typically, 6 GB will be enough to run most high-performance applications and games without a hitch. However, if your motherboard only has three slots and you want to add RAM in a year or two, you are stuck. It is important to not only consider what you want now, but also consider what you may want in the future when matching RAM with the motherboard.
Choosing a processor to match your DDR3 RAM is a bit simpler than getting the right motherboard. In most cases, the processor really does not matter much in terms of communicating with the RAM. However, it is worth noting because choosing a motherboard that supports DDR3 RAM will often limit your processor selection. This occurs because DDR3 RAM is typically considered a performance component, and is therefore supported by high-performance motherboards. As a result, high-end processors, such as an Intel Core or AMD Phenom, are often necessary to match your DDR3 memory.