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So you're adding computer RAM, but don't know the types of RAM

By Robert B.

So you've decided that you're adding computer RAM, but all of the talk of DDR, SD, and RM just confuses you? That's where I hope this tutorial will help you choose types of RAM for your computer.

Here are the various choices you'll have when adding computer RAM: amount of memory and speed of your memory.


The amount of memory you purchase should be AT LEAST 128 MB. The more memory your computer has, the faster that applications run. I'd recommend 256 MB of RAM, it's not much more expensive than 128 MB.

Speed of RAM is in MHz; SD RAM goes up to 133 MHz, DDR RAM goes up to 400 MHz, while RD RAM goes up to 800 MHz.

  • Buy SD RAM here. icon - Known as Synchronous DRAM, this is one of the oldest types of RAM. It is used on older motherboards, usually ones with Pentium III or older processors. These run up to 133 MHz and are known as PC133. The other most common type is PC100 which runs at 100 MHz.



  • Get some DDR RAM here. icon - When you're adding computer RAM, chances are this is the type you'll need; DDR is the most common type of RAM. It runs must faster than SD RAM, up to speeds of DDR 400 MHz, otherwise known as PC3200. RAM of this speed is more than enough, generally too powerful that your motherboard will run it at a lower speed anyways. DDR 333 MHz RAM, or PC2700 should be more than powerful enough for your computer.





  • Purchase some RD (Rambus) RAM here. icon - This is the fastest and most efficient type of memory, which makes it slightly more expensive than the other types of RAM. Before adding computer RAM of this type to your motherboard, make sure it and your processor (Pentium IV) supports it. You also have to add two RD RAM chips at a time because of the way it's configured. RD RAM can get up to speeds of 800 MHz!


Well, before you go about adding computer RAM, here is how to determine which type you need:

  • If you have a new motherboard, check the owners manual or manufacturer, this is the sure way to purchase the correct type when you're adding computer RAM.
  • If you want to add RAM to your current motherboard, the easiest way is to see which type of RAM you currently have. First open your computer case. Remove your current RAM by pushing down on both of the retaining clips holding the RAM in place. Your RAM should have the type and speed printed on it. That's the type you need!



Well I hope I was able to help you when selecting types of RAM when adding computer RAM to your PC. Now you need to install your RAM!



Want even more details to choose RAM?

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