Knowing how to check how much RAM you have is the first step before buying anything, booking a technician, or diagnosing a slow machine. It takes seconds on Windows, macOS, or Linux, and the result tells you whether an upgrade is worth pursuing at all. This guide covers both: how to find your current RAM figure, and what to do if that figure isn't enough.
How to check your RAM on Windows
On Windows 10 and 11, the fastest method is the Task Manager. Press Ctrl + Shift + Esc, click the Performance tab, then select Memory in the left panel. You'll see your total installed RAM, how much is in use right now, your RAM's speed in MHz, and the number of slots used versus slots available. That last detail matters a lot before you buy anything.
Alternatively, right-click the Start menu, choose System, and look under "Installed RAM" in the Device Specifications section. It gives you the total figure immediately, though it won't tell you speed or slots.
For the most detail, run wmic memorychip get capacity, speed, memorytype in a Command Prompt window. This returns a row for each physical stick, so you can see how many modules are installed and at what speed. That output is what you need before walking into a computer shop.
How to check your RAM on macOS
Click the Apple menu, choose About This Mac, and your RAM figure sits right there in the overview. For more detail, click System Report, then navigate to Hardware Overview or expand the Memory section. You'll see each slot listed individually, along with speed and type.
On Macs with Apple Silicon (the M1, M2, M3, and M4 chips), that memory figure refers to unified memory. It's integrated into the processor package, not seated in a removable slot. You cannot upgrade it after purchase. If your Mac runs Apple Silicon, the RAM question is settled at the point of sale.
How to check your RAM on Linux
Open a terminal and run free -h for a quick total. For the full picture including slot data, speed, and manufacturer, run sudo dmidecode --type memory. This command returns a detailed block for every memory slot, occupied or empty, which is exactly what you need to plan an upgrade on a Linux-based workstation or server.
Reading the output: what the numbers mean
Your RAM figure means very little without context. 8 GB on a machine running only a browser and email is fine. 8 GB on a machine running virtual machines, video editing software, or a modern IDE with 20 open tabs is the reason everything crawls. The in use figure from Task Manager or free -h at idle tells you more than the installed total. If you're sitting at 85–90% usage while doing nothing intensive, adding RAM will help immediately.
Speed matters too, though less than capacity in most day-to-day workloads. DDR4 at 3200 MHz is the baseline in most machines built since 2019. DDR5 appears in machines from 2022 onward and runs faster, but you can't mix the two. If you're wondering whether 16 GB is actually enough for your workload, the answer depends more on what you're running than on the number itself.
Deciding whether an upgrade is worth it
Not every slow machine needs more RAM. Run your normal workload for 30 minutes, then check the Task Manager or free -h output. If RAM usage consistently sits above 85%, an upgrade will help. If it's sitting at 50% and your machine is still slow, the bottleneck is probably the CPU, the storage drive, or a software issue, and buying RAM won't fix it.
A few other checks before you buy:
- Confirm your motherboard or laptop supports the upgrade. Task Manager's slot information tells you how many slots are free. A machine with 2 slots and 2 sticks already installed requires you to remove old RAM to add new, which may not be cost-effective.
- Match the type. DDR4 and DDR5 are physically incompatible. Check your existing RAM type first.
- Check whether your laptop's RAM is soldered. Many thin-and-light laptops since 2018 have RAM soldered to the motherboard with no upgrade path at all. The
dmidecodeoutput on Linux or the System Report on macOS will tell you if this is the case.
How to physically upgrade your RAM
On a desktop, shut down completely, unplug the power cable, and discharge static by touching the metal chassis. Locate the RAM slots on the motherboard, release the retention clips at both ends of the existing sticks, and slide them out. Align the new module with the notch in the slot and press down firmly until the clips click. It's one of the most straightforward PC upgrades there is.
On a laptop, the process is similar but tighter. Turn the machine over, unscrew the base panel (a standard Philips screwdriver handles most), locate the RAM slots, and swap the modules. Some laptops hide the slots under the battery or a secondary panel. If you're unsure, the service manual for your specific model is worth finding before you start. Many manufacturers publish these free.
After fitting new RAM, boot into the BIOS to confirm the system has detected it correctly. On Windows, check Task Manager again. On Linux, rerun free -h. If the system only recognises part of what you installed, reseat the sticks, one slot at a time.
What to expect after an upgrade
If RAM was genuinely your bottleneck, the difference is immediate. Applications open faster, multitasking becomes smoother, and the fan stops screaming under light loads. If you were RAM-constrained and running Windows 10 or 11, you'll also see a reduction in disk activity because the system relies less on the page file.
One thing worth checking after any RAM upgrade: if you've added new sticks of a faster specification than your old ones, the system may default to a slower common speed. Enable XMP (on Intel platforms) or EXPO (on AMD platforms) in the BIOS to run the new RAM at its rated speed. It's a one-toggle change that most people skip.
It's also worth noting that RAM prices shift considerably over time. Before you buy, it pays to understand what's driving current pricing. RAM prices have climbed sharply in 2026, so shopping around and checking multiple Australian retailers before committing is worth the extra ten minutes.
If your upgrade path is blocked because the RAM is soldered, or because the machine is too old to justify the spend, the more effective option is usually a new SSD. A fast NVMe drive in an older machine with limited RAM will often outperform a RAM upgrade in a machine with a slow spinning disk. Installing and formatting an SSD is a similarly straightforward process and frequently delivers a more noticeable improvement than RAM alone on older hardware.