Science and Tech
A Beginner's Guide to PC-Building Terminology

Devin Connors | 8 Sep 2014 10:00
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RAM: Not as complicated as it looks


RAM (Random Access Memory), or memory, is the other hardware that takes a minute of pause before pulling the Amazon or Newegg trigger.

There are currently two types of RAM out in the consumer PC world, with a third rapidly approaching.

DDR3: This is the kind of RAM you'll be buying for your PC right now, regardless of your AMD or Intel preference. DDR3 has been around since 2007, and it's on the brink of being replaced with...

DDR4: DDR4 memory just became available to consumers, and the first platform to support the new standard is Intel's X99 chipset (for its new Haswell-E CPUs). If you are building a PC with any other kind of motherboard, avoid DDR4, as it will not work in your machine.

GDDR5: GDDR5 is only used in graphics cards to support bandwidth-hungry GPUs, so you won't be buying any to drop in your motherboard.

The two things you need to factor in when buying DDR3 RAM? Speed, and channel configuration, both of which are tied to your choice in motherboard. The majority of desktop motherboards support a range of different speeds, from the pedestrian DDR3-1333 (the 1333 represents the MHz speed of the memory) and DDR3-1600, to the more enthusiast-oriented DDR3-2133, -2400, or -2800.

Channel configuration is all about how RAM communicates, and consequently how it's paired. The CPU socket type you choose will dictate what kind of RAM you can use, with some sockets supporting dual-channel RAM, others supporting triple-channel memory, and others still supporting quad-channel memory. The latter is currently only found on Intel's latest X99 motherboard chipset.

Each channel currently represents a 64-bit communication path. Dual-channel has two 64-bit channels, triple-channel has three, and so on. While a dual-channel memory system has a 128-bit bus, a triple-channel setup has a 192-bit bus. The more channels, the more bandwidth you have to play with.

The channel configuration also dictates how RAM is traditionally paired by manufacturers. Your average dual-channel memory kit will have two, or four sticks of RAM. Triple-channel comes in three, or six sticks.

Oh, one last note: if you're using a PC with an APU, buy the fastest RAM you can afford. While a graphics card has dedicated memory, the graphics chip inside your APU relies on system memory/RAM. The faster the RAM, the more horsepower you can squeeze out of your APU!

Power Supplies!

The power supply, or PSU, sends juice to every component in your PC. The key points in a PSU are Wattage, rails, efficiency, and whether or not to go modular.

Wattage: Every power supply can supply a stated amount of power to your PC. The advertised number is the peak amount of power, even though the PSU will almost always run lower than that.

If you're building a gaming PC, chances are you'll be looking at a power supply between 600 and 800 Watts. If you're an enthusiast who plans on running multiple GPUs, then 800 to 1000 Watts. And if you're not really the gaming type? A 300 to 400 Watt PSU is right up your alley.

Rails: The rail is what distributes power within the PSU to the various components. There are two options here: A single +12V rail design, or a multi-rail design. Most PSUs made right now use a single +12V rail design, meaning one rail sends power to your CPU, GPU, and so on. The one major drawback with a single rail design: If something goes wrong, it could potentially damage multiple system components. A multi-rail design uses the same +12V design, but it's split among several amperage-monitoring channels. This design can keep your components safer - if one circuit overloads, it can only hurt components attached to that circuit - but the multi-rail design also have power limitations. Too much hardware on one rail could cause a safe, but annoying overload shutdown.

Efficiency: You'll want to buy the most efficient PSU possible. Thankfully, the 80 PLUS system tells you how efficient a PSU can be. The top rating, 80 PLUS Titanium, always maintains an efficiency of 89 percent or better. Check out this 80 PLUS chart for more detailed information.

Modular: Some PSUs are modular, meaning many of their component connector cables can be removed (in the event they aren't being used). This feature usually comes at a modest price increase, and can help keep the inside of your desktop clutter-free.

If you're new to the PC-building game, this list should have answered at least a few of your questions, and will hopefully start you down the righteous PC Master Race path. Reading is certainly short of building, but a little time, a lot of patience, and maybe a few curse word strings should result in a rockin' gaming box of your own.

Questions? Concerns? Suggestions for future articles? Drop them in the comments, and let's have a conversation.


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