The fastest way to add memory is to install a RAM stick in an empty slot on your motherboard

Your PC's memory (RAM) is separate from storage. Adding RAM means physically inserting a new stick into your motherboard, not buying a larger hard drive. Most PCs have two to four memory slots, and if one is empty, you can add a stick without removing anything. The whole process takes about five minutes and costs between $30 and $150 depending on the type and amount you buy.

Before you buy anything, you need to know three things: how much memory your motherboard can hold, what type of RAM your PC uses, and whether you have an empty slot. If all your slots are full, you'll have to remove an old stick first. The steps below show you how to find this information and install the new memory.

Key Takeaways

  • Check how much RAM your PC currently has and what type it uses by opening Settings > System > About on Windows, or Apple menu > About This Mac on Mac.
  • Look up your motherboard model number to find the maximum memory it supports and how many empty slots you have.
  • Buy RAM that matches your motherboard's type (DDR4 or DDR5 for newer PCs, DDR3 for older ones) and speed.
  • Power off your PC completely, unplug it, and touch a metal part of the case to discharge static electricity before opening it.
  • Insert the new RAM stick at a 45-degree angle, then press down firmly until the clips on both ends snap into place.

Find out what RAM your PC currently has

On Windows: Right-click the Start button, select "System," then scroll down to "Device specifications." You'll see "Installed RAM" listed there. This tells you how much memory you have now. Write down the number.

To find the type of RAM, open Settings > System > About again, scroll to the bottom, and click "Advanced system settings." In the window that opens, click the "Hardware" tab, then "Device Manager." Expand "Memory" in the list. You'll see entries like "DDR4" or "DDR5"—that's your RAM type. If Device Manager doesn't show the type clearly, you can also read CPU-Z (a free tool from cpuid.com), run it, and click the "Memory" tab to see your RAM type and speed.

On Mac: Click the Apple menu in the top-left corner, select "About This Mac," and you'll see "Memory" listed in the Overview tab. It will show something like "16 GB DDR4" or "8 GB DDR5"—both the amount and type are right there.

Check your motherboard's memory limit and available slots

Your motherboard has a maximum amount of RAM it can hold. If you have 8 GB now and your motherboard maxes out at 16 GB, you can only add 8 GB more. To find this limit, you need your motherboard model number.

On Windows: Open Settings > System > About, scroll down to "Device specifications," and look for "System Model." Write that down. Then go to the manufacturer's website (usually Dell, HP, Lenovo, ASUS, or MSI) and search for your model number. Look for the specifications or manual, and find the section on memory. It will list the maximum RAM and the number of slots.

On Mac: Click Apple menu > About This Mac > System Report. Under "Hardware Overview," look for "Model Identifier." Search that number on Apple's support site or your Mac's manual to find the memory limit.

If you can't find your exact model, you can also open your PC's case and look at the motherboard directly. The model number is printed on the board itself—it's usually a string like "B450M-DS3H" or "Z790-E." Search that number on the manufacturer's website.

Buy the right type and amount of RAM

RAM comes in different types, and you must buy the same type your PC uses. The most common types for newer PCs are DDR4 and DDR5. Older PCs may use DDR3. You cannot mix types—a DDR5 stick will not fit in a DDR4 slot.

RAM also comes in different speeds, measured in MHz (like 3200 MHz or 6000 MHz). Your motherboard supports a specific speed range. If you buy RAM that's faster than your motherboard supports, it will run at the motherboard's speed, so you won't waste money—but you also won't gain the speed benefit. It's safe to buy RAM at the same speed your current RAM uses, or slightly faster.

Common amounts are 8 GB, 16 GB, and 32 GB per stick. If you have one 8 GB stick and want 16 GB total, buy another 8 GB stick. If you have two 8 GB sticks and want 32 GB total, you'll need to remove one and install a 16 GB stick, or remove both and install two 16 GB sticks (depending on your motherboard's slot count).

Buy from a computer parts retailer like Newegg, Amazon, or a local computer store. Prices vary, but 16 GB of DDR4 RAM typically costs $40 to $80, and DDR5 costs $50 to $120.

Power down and prepare your PC for installation

Shut down your PC completely—don't just put it to sleep. Wait 30 seconds after shutdown to make sure all power drains from the motherboard. Then unplug the power cable from the back of the case.

Open your PC's case. Most cases have two thumbscrews on the back panel, or a side panel that slides off. If you're not sure, check your case's manual or search your case model online for a quick video.

Before you touch anything inside, touch a metal part of the case with your bare hand for a few seconds. This discharges static electricity from your body, which can damage RAM and other components. Some people wear an anti-static wrist strap (available for $5 to $15 online), but touching the case works fine.

Locate the memory slots and install the new RAM

Look at your motherboard. Memory slots are long, narrow slots usually near the CPU (the large square chip in the center). They're typically labeled "DIMM1," "DIMM2," etc. Empty slots are straightforward to spot—they have no stick in them. If all slots are full and you want to add more memory, you'll need to remove one stick first by gently pushing the clips on both ends outward until the stick pops up slightly, then pulling it straight out.

Take your new RAM stick and hold it so the notch (a small cut in the bottom edge) lines up with the key (a raised bump in the slot). This prevents you from inserting it backward. Position the stick at a 45-degree angle above the slot, then press down firmly and evenly on both ends. You'll feel resistance, but keep pressing. When the stick is fully seated, the clips on both ends will snap into place with a click, and the stick will be level with the motherboard.

Close your case, plug in the power cable, and turn on your PC. Windows or Mac will recognize the new memory automatically—you don't need to install drivers or change settings. Open Settings > System > About (Windows) or Apple menu > About This Mac (Mac) to confirm the new total is showing.

Troubleshooting if your PC won't start after installation

If your PC doesn't turn on or shows error messages after you install the new RAM, the stick may not be fully seated. Power off, unplug, touch the case again, and press down on the RAM stick once more, making sure you hear both clips click. If it still doesn't work, remove the new stick and restart your PC to confirm it boots with the old RAM. If it does, the new stick may be defective—contact the retailer for a replacement.

If your PC starts but shows the wrong amount of memory (for example, it shows 8 GB instead of 16 GB), restart your PC. Sometimes the BIOS (the firmware that runs before Windows or Mac loads) needs to refresh. If it still shows the wrong amount after a restart, the stick may not be fully clicked in. Power off, unplug, and reseat it.

Frequently Asked Questions

Can I mix different brands of RAM?

Yes. As long as both sticks are the same type (DDR4 or DDR5) and speed (like 3200 MHz), they will work together even if one is made by Corsair and the other by Kingston. Mixing brands is common and causes no problems.

What if all my memory slots are full?

You'll need to remove one or more old sticks to make room. If you have two 8 GB sticks and want 32 GB total, remove both and install two 16 GB sticks. If you have four slots and all are full with 4 GB sticks, you can remove two of them and install larger sticks in their place.

Will adding RAM make my PC faster?

It depends on what's slowing it down. If your PC is slow because you're running out of memory (you see "low memory" warnings or your hard drive is constantly working), adding RAM will help noticeably. If your PC is slow because your CPU or hard drive is old, adding RAM won't fix that.

Do I need to update my BIOS after adding RAM?

No. Modern motherboards recognize new RAM automatically. You only need to update your BIOS if your motherboard doesn't recognize the new stick after you've restarted twice, which is rare.

Is it safe to install RAM myself?

Yes. RAM installation is one of the safest upgrades to do yourself. The biggest risk is static electricity, which you prevent by touching the case before you work. Take your time, don't force anything, and you'll be fine.