RAM upgrades are straightforward if you follow the right order

Adding RAM to your PC means opening the case, locating the memory slots on your motherboard, and inserting new RAM sticks into the empty slots. The whole job takes about 15 minutes and requires no tools beyond a Phillips screwdriver. The hardest part is usually just getting the case open — the actual RAM installation is mechanical and hard to get wrong if you follow the steps in order.

Before you buy anything, you need to know three things: how much RAM your motherboard can hold, what type of RAM your PC uses, and whether you have empty slots or need to replace existing sticks. This guide walks you through checking all three, buying the right RAM, and installing it safely.

Key Takeaways

  • Check your motherboard's manual or use CPU-Z software to find out what type of RAM your PC uses (DDR4 or DDR5) and how many slots are available.
  • Buy RAM that matches your existing sticks in speed and type — mixing different speeds can slow your whole system down.
  • Power off your PC completely, unplug it, and touch a metal part of the case to discharge static electricity before opening the case.
  • RAM sticks only fit one direction — align the notch on the stick with the key in the slot, then press down firmly until both clips snap into place.
  • If your PC does not recognize the new RAM after restart, reseat it (remove and reinstall) or try each stick in different slots to find the problem.

Find out what RAM your PC currently uses

The easiest way is to use CPU-Z, a free tool that reads your system information. read it from cpuid.com, run it, and click the Memory tab. You will see the type (DDR4 or DDR5), the speed in MHz, and the total capacity. Write these numbers down.

If you want to check your motherboard manual instead, you need the motherboard model number. Restart your PC, press Delete or F2 during startup (timing varies by manufacturer), and look for the model name in the BIOS menu. Then search online for "[your motherboard model] manual" and look for the memory specifications page.

You also need to know how many RAM slots your motherboard has and how many are already filled. Open your PC case and look at the motherboard — RAM sticks stand upright in long slots, usually near the CPU. Count the total slots and count how many have sticks in them already. If all slots are full, you will need to remove an old stick to make room for a new one.

Buy RAM that matches your system

RAM comes in different types, and mixing types can cause your PC to run slowly or not start at all. The type is printed on the stick itself and also listed in CPU-Z. DDR4 and DDR5 are the two current types — they look different and do not fit in the wrong slot, so you cannot install the wrong type by accident.

The speed (measured in MHz) also matters. If you have 3200 MHz RAM and add 2666 MHz RAM, your PC will run both sticks at the slower speed. Buying RAM that matches your existing sticks in both type and speed is the safest choice. If you are replacing all your RAM, you have more freedom, but stick with what your motherboard supports — check the manual or CPU-Z for the maximum speed your system can handle.

Capacity is measured in GB. Common sizes are 8GB, 16GB, and 32GB per stick. If you have two 8GB sticks and want more, you can add another 8GB stick or replace both with larger ones. Most modern PCs run well with 16GB total (two 8GB sticks), but video editing, 3D rendering, and heavy multitasking benefit from 32GB or more.

Prepare your PC for opening

Shut down your PC completely — do not just put it to sleep. Unplug the power cable from the back of the case. Wait 30 seconds for the power to drain completely.

Static electricity can damage RAM and other components. Before you touch anything inside the case, touch a metal part of the case frame with your bare hand to discharge any static charge you are carrying. You can also wear an anti-static wrist strap, which clips to the case and keeps you grounded the whole time you are working.

Lay the PC on its side on a clean, flat surface. Most cases have two large screws on the back panel — remove them and slide the side panel off. Set the screws somewhere you will not lose them. You should now see the motherboard, CPU, and RAM slots clearly.

Remove old RAM if necessary

If you have empty slots, skip this section. If all slots are full and you need to add more RAM, you will need to remove one or more old sticks first.

Look at the ends of the RAM sticks — there is a small clip on each side of the slot. Push both clips outward (away from the stick) and the stick will pop up at an angle. Grab it by the top edges and pull it straight out. Set it aside in a safe place — you may want to keep it as a backup or sell it.

Install the new RAM

Hold the new RAM stick by its top edges, with the notch (a small cutout on the bottom edge) facing toward the slot. Line up the notch with the key (a raised ridge inside the slot) so the stick can only go in one direction. This prevents you from inserting it backward.

Press the stick down firmly into the slot. You will feel resistance — this is normal. Keep pressing until both clips snap into place on either side. The stick should sit flush with the slot, not at an angle. If it does not sit flat, remove it and check that the notch is aligned with the key.

If you are adding multiple sticks, repeat this process for each empty slot. RAM sticks can go in any order, so do not worry about which slot you use.

Power on and check that the RAM is recognized

Slide the side panel back on and screw it closed. Plug in the power cable and press the power button. Your PC should start normally.

Once Windows loads, open CPU-Z again and check the Memory tab. The total capacity should now show your old RAM plus the new RAM. For example, if you had 16GB and added 8GB, it should show 24GB total. If the new RAM does not appear, power off, unplug, and reseat the stick — remove it completely and press it back in firmly. Try restarting again.

If reseating does not work, try moving the new stick to a different slot. Sometimes one slot is faulty and another works fine. If you still do not see the new RAM after trying all slots, the stick itself may be defective — contact the seller about a return.

Frequently Asked Questions

Can I mix RAM from different brands?

Yes, as long as the type and speed match. A Kingston stick and a Corsair stick of the same DDR4 speed will work together fine. Mixing brands is common and not a problem — matching the specs is what matters.

Do I need to update my BIOS after adding RAM?

No, not usually. Your PC will recognize new RAM automatically. BIOS updates are only needed if your motherboard does not recognize the new RAM at all, and even then, a BIOS update is a last resort — try reseating the stick first.

What if my PC does not start after I add RAM?

Power off when ready, unplug, and reseat the RAM — remove it and press it back in firmly. Also check that you did not accidentally bump any other cables or components while the case was open. If it still does not start, try removing the new RAM and starting with just the old RAM to confirm the new stick is the problem.

Is it safe to add RAM while the PC is on?

No. Always power off completely and unplug before opening the case. Adding or removing RAM while the PC is running can damage the motherboard and the RAM itself.

How do I know if my PC needs more RAM?

If your PC feels slow when you have many programs open, or if you see a message about low memory, more RAM will help. Open Task Manager (Ctrl+Shift+Esc), click the Performance tab, and look at Memory usage. If it regularly hits 80% or higher, adding RAM will improve speed.