How to upgrade RAM on a PC (2026)
Quick Answer
To upgrade RAM on a PC, first confirm exactly what memory your motherboard and CPU support, then power down, unplug the machine, fit the new RAM sticks into the correct slots, and check in BIOS or your operating system that the full amount is detected. If you want the RAM to run at its rated speed, you may also need to enable the memory profile setting in BIOS, often called XMP, EXPO or DOCP depending on the platform.
Overview
Upgrading RAM is one of the simplest PC upgrades, but it only goes smoothly if you check compatibility before buying anything. Desktop and laptop memory are different, generations such as DDR4 and DDR5 are not interchangeable, and many motherboards want modules installed in specific slots for dual-channel operation. The safest way to confirm support is to check the motherboard manual and the PC or motherboard maker’s support page, then compare that with the label on your existing RAM or the specifications of the new kit. The basic process is: identify the right memory type and capacity, shut the PC down fully, open the case, remove old modules if needed, install the new ones firmly, then confirm detection in BIOS and in Windows or your chosen operating system. If the system fails to boot afterwards, the most common causes are a module not fully seated, the sticks being in the wrong slots, or using memory the board does not support. For gaming, more RAM can reduce stutter caused by memory pressure and help with multitasking, but it will not always increase frame rates on its own. The best result usually comes from using a matched kit installed in the recommended slots and configured correctly in BIOS.
Who this is for
PC owners upgrading desktop gaming memory themselves, including first-time builders replacing or adding DIMMs. It may also help laptop owners, but only if their laptop has user-accessible upgradeable RAM rather than soldered memory.
What you’ll need
- Compatible RAM modules for your motherboard or laptop
- Motherboard, PC or laptop manual
- A clean, well-lit workspace
- A screwdriver if your case or laptop access panel requires one
- Access to BIOS or UEFI after installation
Before you start
Check the exact memory generation, form factor and supported configuration before opening the PC. Confirm whether you need desktop DIMMs or laptop SO-DIMMs, whether the system uses DDR4 or DDR5, and whether there are preferred slots for two modules. If you are mixing old and new RAM, expect the system to run all memory at the speed and timings the platform can safely support; mixing can work, but a matched kit is usually the least troublesome choice. Also check whether your system is under warranty and whether opening it affects support terms.
Step-by-step
- 1
Confirm compatibility and plan the upgrade
Find your motherboard or laptop model and check the official manual or support page for supported memory type, slot population order and any platform limits. If the PC already has RAM installed, note the existing module type and slot use before buying or fitting anything. Decide whether you are adding to the existing memory or replacing it with a matched kit.
Why: RAM must match the platform physically and electrically. Installing the wrong generation or wrong module type will not work, and using the wrong slot order can prevent dual-channel operation or stop the system booting.
- 2
Shut down fully and make the system safe to handle
Shut the operating system down completely, switch the power supply off if your desktop has a rear switch, and unplug the power lead. Disconnect peripherals that get in the way. Press the power button once after unplugging to help discharge any remaining standby power, then move the PC to a stable work surface.
Why: This reduces the risk of electrical damage and avoids trying to fit components while standby power is still present.
- 3
Open the case or memory access panel
Remove the side panel on a desktop case, or the service panel on a laptop if the model allows RAM access. Touch an unpainted metal part of the case before handling memory and avoid working on carpet if possible. Hold RAM only by the edges and avoid touching the gold contacts.
Why: Memory is sensitive to static discharge and contamination. Good handling reduces the chance of damage or intermittent contact problems.
- 4
Locate the RAM slots and remove old modules if required
Identify the memory slots next to the CPU on a desktop motherboard, or the SO-DIMM slots in a laptop. If you are replacing modules, open the retaining clips and lift the old RAM out carefully. If you are adding RAM, check the manual for the correct empty slot or pair of slots to use.
Why: Different boards expect memory in a specific order. Removing or adding modules carefully prevents damage to the slot and ensures the final layout matches the manufacturer’s guidance.
- 5
Install the new RAM correctly
Align the notch in the RAM with the key in the slot so it can only go in one way. On desktops, press the module straight down firmly until the retaining clips lock into place. On laptops, insert the module at the angle specified by the maker, then press it down until it clicks under the side retainers. If you are using two or more sticks, place them in the recommended paired slots shown in the manual.
Why: A module that is not fully seated is the most common cause of no-boot after a RAM upgrade. Correct slot placement also enables the intended memory channels for best performance.
- 6
Reassemble and boot into BIOS or UEFI
Refit the case panel, reconnect power and start the PC. Enter BIOS or UEFI during startup and check that the installed memory amount is detected. If your RAM kit is rated for a higher speed than the platform’s default safe setting, look for the memory profile option, often labelled XMP, EXPO or DOCP, and enable the appropriate profile only if the motherboard and CPU support it.
Why: BIOS is the first place to confirm that the hardware is recognised. Enabling the memory profile allows compatible RAM to run at its intended settings rather than a conservative default.
- 7
Verify in the operating system and test stability
Boot into the operating system and confirm the total RAM shown matches what you installed. Use the system normally and, if you want extra confidence, run a memory test or the built-in memory diagnostics tool provided by your operating system or motherboard maker. If you see crashes, blue screens or random restarts, go back to BIOS defaults or reseat the RAM and test again.
Why: Successful booting alone does not guarantee stability. A short verification step helps catch seating, compatibility or profile-related issues before they cause data corruption or game crashes.
Why this works
RAM stores data the CPU needs quickly. Adding more memory helps when your games and background tasks exceed the available RAM, reducing reliance on much slower storage-based paging. Installing matched memory in the correct channels also improves bandwidth and consistency compared with a poor slot layout or a single module.
Common mistakes to avoid
- Buying the wrong memory generation or form factor
- Not checking the motherboard manual for the correct slot order
- Mixing unmatched RAM and expecting it to run at the highest advertised settings
- Not pressing the module in fully until the latches engage
- Forgetting to enable the memory profile in BIOS after installation
- Touching the gold contacts or forcing a module in the wrong orientation
Troubleshooting
PC powers on but shows no display after the upgrade
Power off, unplug the system, and reseat the RAM carefully. Make sure each module is fully inserted and the retaining clips are locked. Check the manual to confirm you used the recommended slots.
Only some of the installed RAM is detected
Check whether one module is not seated properly, whether a slot is unused when the board expects a paired layout, or whether the motherboard or operating system edition has its own limits. Test one module at a time to isolate a bad stick or slot.
System boots but games crash or Windows becomes unstable
Return BIOS memory settings to default or disable XMP, EXPO or DOCP and test again. If stability returns, check for a BIOS update from the motherboard maker and verify the kit is supported for your platform.
New RAM runs at a lower speed than expected
This is often normal until you enable the memory profile in BIOS. Also remember that mixing different kits can force lower speeds or looser timings.
Laptop has no accessible RAM slot
Some laptops use soldered memory or require more disassembly than a simple access panel. Check the service manual before proceeding; if memory is soldered, it cannot be upgraded in the usual way.
Compare your options
Add RAM to the existing modules
Best for: People with spare slots and matching or compatible memory available
Pros: Can be cheaper than replacing everything; keeps a working setup in place
Cons: Mixing kits can reduce speed or stability; matching specifications exactly can still be awkward
Replace all RAM with a matched kit
Best for: People who want the simplest route to stability and rated performance
Pros: Lower chance of compatibility issues; easier to configure; better for dual-channel pairing
Cons: Means removing working RAM; can cost more than adding one extra module
Keep the current RAM
Best for: Systems that already have enough memory for current games and background tasks
Pros: No cost and no risk of compatibility issues
Cons: Does not solve stutter or slowdowns caused by memory pressure
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Add RAM to the existing modules | People with spare slots and matching or compatible memory available | Can be cheaper than replacing everything; keeps a working setup in place | Mixing kits can reduce speed or stability; matching specifications exactly can still be awkward |
| Replace all RAM with a matched kit | People who want the simplest route to stability and rated performance | Lower chance of compatibility issues; easier to configure; better for dual-channel pairing | Means removing working RAM; can cost more than adding one extra module |
| Keep the current RAM | Systems that already have enough memory for current games and background tasks | No cost and no risk of compatibility issues | Does not solve stutter or slowdowns caused by memory pressure |
Alternatives
- Reduce memory-heavy background apps instead of upgrading
- Improve overall responsiveness with a storage upgrade if paging to disk is the main bottleneck
- Use a professional repair shop if the system is hard to open or warranty-sensitive
Pro tips
- Take a photo of the existing RAM and slot layout before removing anything.
- If you are buying new RAM, a matched kit is usually safer than buying separate sticks later.
- Install two modules in the manufacturer’s preferred paired slots rather than side by side unless the manual says otherwise.
- Check for a BIOS update if a supported RAM kit will not run stably at its profile settings.
- For gaming, more RAM helps most when you are currently running close to full usage.
Safety notes
- Unplug the PC before opening it and avoid working while standby power is present.
- Handle RAM by the edges and avoid touching the contacts.
- Do not force a module into a slot; if it does not align, recheck orientation and compatibility.
- Be careful around sharp case edges and small screws when opening the system.
What this guide does not cover: This guide does not cover server memory, ECC configuration in workstation platforms, or model-specific laptop disassembly beyond a basic user-accessible RAM upgrade.
Cost considerations
RAM upgrades are usually one of the more cost-effective PC upgrades, but value depends on whether your current games are actually memory-limited. Replacing the whole set with a matched kit often costs more upfront than adding one stick, but it can save time and trouble by avoiding compatibility issues.
Frequently asked questions
Can I mix different RAM brands or sizes?+
Sometimes yes, but there is no guarantee of ideal performance or stability. The system will usually fall back to settings that all installed modules can handle. A matched kit is the safer choice.
How do I know whether I need DDR4 or DDR5?+
Check the motherboard or laptop manual and the official support page for your exact model. DDR4 and DDR5 are not interchangeable.
Do I need to change anything in BIOS after installing RAM?+
At minimum, check that the full capacity is detected. If your RAM supports a higher rated speed, you may need to enable the memory profile option such as XMP, EXPO or DOCP.
Will more RAM increase gaming FPS?+
It can help if your current system is short on memory, especially with modern games and background apps, but it does not always raise frame rates directly. It is more likely to reduce stutter and improve consistency when memory pressure is the problem.
What if my PC will not boot after the upgrade?+
Power off, unplug it, reseat the RAM and check the slot order against the manual. If needed, test one module at a time and reset BIOS settings to default.
Sources & references
Guidance on this page is traced to documented sources. Last checked 25 September 2026.
- Crucial Support - How to install RAM in a desktop PC · manufacturer
Supports the practical installation sequence for desktop RAM, including powering down, opening the system, seating DIMMs correctly and checking they are recognised.
- Crucial Support - How to install RAM in a laptop · manufacturer
Supports the laptop-specific process, including checking accessibility, handling SO-DIMMs correctly and verifying installation.
- Intel - What is XMP? · manufacturer
Supports the explanation that performance memory may need a BIOS profile such as XMP enabled to run at advertised settings.
The physical upgrade process changes slowly, but motherboard memory support, BIOS options and platform generations change over time.