How to Add RAM to Older Computers Double Data Rate 4 (DDR4) is the current standard for memory sticks, with a base speed of 2133 MHz, and this has been the case since around 2015.

Now we get to the computer’s main memory. Generally known as RAM (for Random Access Memory), this is a set of chips your computer uses to store programs and data when it’s running.

Running out of memory can cause performance issues. Here's how to see how much memory is in your PC, and how fast it is.