Here's a short summary of the most popular types of memory and what the numbers refer to.ĭDR2 PC2-4200 (commonly referred to as DDR2-533) memory is DDR2 designed for use in systems with a 266MHz front-side bus (providing a 533MT/s data transfer rate). But if you don't know a lot about memory, the numbers can be confusing.

Rather than give memory modules catchy names, the industry refers to modules by their specifications.

We recommend that you use either the Crucial Memory Advisor™ or Crucial System Scanner to find the right memory for your computer. However, your system will operate at the speed of the slowest memory module installed. Memory is designed to be backward compatible within its generation, so generally speaking, you can safely add faster memory to a computer that was designed to run slower memory. But before clicking that “buy” button on this or any website, it’s important to make sure the memory you are buying is compatible with your PC.ĭDR4 memory is the latest generation of memory for computing applications and offers many benefits over previous generations of memory including lower latencies, higher speeds, and more. One thing to keep in mind is that memory needs to be the same type - memory modules are not forward or backward compatible in terms of generation types so DDR3 will not work in DDR2 or DDR4. Adding more memory to your PC is one of the best and easiest ways to improve system performance.

Speccy ram low speed