Step-By-Step: Add RAM for a Faster PC

Find the Correct DIMM

Memory modules may look virtually identical, but they're not interchangeable. To ensure you're using the correct RAM, check the Web sites of the makers listed in "The Top Down." Most have instructions for finding RAM that will match your PC's.

1. See how much RAM your PC has.

From within any version of Windows, right-click My Computer and select Properties. The dialog box displays the amount of RAM at the bottom. Many PCs also show the total amount of RAM as they start up.

2. Find the RAM.

Turn off your PC, unplug it from the wall, and open the case. We suggest wearing an antistatic wrist strap when you work inside your computer. The RAM slots are usually located near the CPU, but closer to the front of the case.

3. Remove the old RAM (optional).

If all your RAM slots are filled, you'll need to remove some of the old modules. Two clips hold each DIMM in its socket. Push down on the clips to open them, rock the modules gently, and lift them straight out of the slots.

4. Insert the new RAM.

Note the notches on your DIMMs--they ensure that the modules can be inserted only one way. Put new DIMMs in the lowest-numbered empty slots first. Carefully press them straight down into the slots, applying gradually increasing pressure. The clips will snap into place when the DIMMs are fully inserted.

5. Power up and check it out.

Plug in your PC, turn it on, and see if it recognizes the new RAM. If not, or if your PC won't start, turn it off, unplug it, and make sure each DIMM is firmly seated. If you had to remove cables to get at the RAM, make sure they're reconnected. If you still have problems, call your memory vendor's tech support line.