Installing a DIMM in your desktop

Step 1: Get out the tools you'll need.

Step 2: Ground yourself.

Static electricity can damage your module and other computer parts. You need to ground yourself to avoid "shocking" your computer. If you have wrist straps designed for this purpose, you should wear them. If you don't have wrist straps, here is the easiest way to ground yourself:

Step 3: Open your computer case.


Every computer case is a little different, so consult your manual if you have any questions about how to open your case. (Note: The memory for Apple iMacs is installed in the back of the monitor. Your iMac manual and the Apple Web site have instructions for opening your system.)

Opening your case  Opening your case

Tip: Make sure you put the screws from your computer case in a safe place so that it's easy to put your system back together again!

Step 4: Find the DIMM slots.

Finding the DIMM slots DIMM Slots
DIMM slots are usually black; there are ejector clips at each end of each slot.
DIMMs fit into slots that look like this. Some of your slots are probably already filled with modules.


Installed DIMM

Open DIMM Slots

Tip: If you have a minitower system, it may be easier to install your DIMMs if you lay your computer on its side.

Step 5: Remove the memory you are replacing (if necessary).

If you have an open DIMM slot, skip this step and go on to Step 6. If all of your DIMM slots are full, you will need to remove one or more of your old modules before you can install the new memory.

Step 6: Install your new module(s).

Installing a DIMM
Line up notches
Notches on the module fit into keys in the slots (circled).
Installing a DIMM
See a different angle.
Place module in slot
Ejector clip is still in "down" position.


  • Use your thumbs to press the module into the slot. Press hard! It takes about 20 lb of pressure to get the module properly inserted in the slot. When you hear a "click" and both side ejector clips snap up around the module, you know it is installed correctly.


  • Installing a DIMM
    See a different angle.
    Push Hard
    When the ejector pins snap up around the module your memory is installed.


    Tip: Try to avoid touching the gold pins at the bottom of your module. You probably won't harm them if you do touch them, but it's better to be safe than sorry.

    Step 7: Test it.

    Before you close your case, turn your computer back on. You should see the new amount of memory displayed on your startup screens or in the properties for "My Computer" (if you use a Windows operating system). If everything works correctly, skip to Step 9. If not, go to Step 8.

    Step 8: Troubleshooting

    If you have trouble with your new RAM, check these things first.

    Step 9: Close your case.


    Congratulations! You have successfully installed your new RAM! Now just put the cover back on your case and plug in your accessories. Your computer should be speeding along in no time.