Diagnosing a PC performance issue can be tricky, especially if you suspect memory is involved. Chances are, you've heard the advice of "just add more RAM", which is a blanket fix that's as old as PC hardware. It's been around since the days of XP, and it's not entirely incorrect. Modern systems are far better at managing memory than they used to be, and adding more RAM often does little unless you’re running into specific bottlenecks. Heavy multitasking and professional workloads require boatloads of memory; if your PC is used for more than just gaming, you might need to add a couple of sticks to your system.

What RAM is actually responsible for

Quick access to data your CPU needs

RAM essentially acts as your system’s short-term workspace. It stores the data your CPU needs to access immediately, and it's far quicker than any kind of non-volatile storage. Once you run out of RAM, you dip into what's called "swap" which is essentially using a non-volatile storage drive like an SSD or HDD to store the data that would otherwise be located in RAM.

Swap is relatively expensive computationally, meaning it's far slower and more intensive for your CPU to get the data it needs from it rather than the dedicated pool of system memory. This is why increasing RAM can sometimes help performance, because if your system is dipping into swap often, your system can slow to a crawl.

When adding more RAM won't help

The point of diminishing returns comes fast

When your PC is under your usual, everyday workload, if you open Task Manager and see that it's using no more than around 60–70% of what you have, adding more RAM probably won't help. Windows is pretty aggressive with how it caches data too, so if you're not sitting close to max capacity in the normal workloads you perform, your bottleneck is likely elsewhere.

Before rushing out to get more RAM, check your CPU temperatures. A thermal throttling CPU can mimic some of the symptoms of RAM spillover, and can happen regardless of the amount of memory installed in your system. An aging boot or scratch drive that isn't an SSD can also affect performance profoundly. If your workloads are relatively light, meaning they're web-based or aren't heavy on memory, even 8 GB can feel fine in certain configurations.

When adding more RAM does help

Heavy multitasking, professional workloads, and some gaming

If you regularly juggle multiple virtual machines, large Excel datasets, or high-resolution images, RAM matters a lot. Moving from 16 GB to 32 GB will be quite noticeable in that scenario. Modern creative software like Blender, Premiere Pro, DaVinci Resolve, After Effects, and many others can easily consume upwards of 32 GB if you let it. Adding more than 32 GB won't be noticeable at all when you're not working, but when you are, you'll notice faster scrubbing, smoother previews, and shorter render times when it's given that extra breathing room.

16 GB used to be the standard number for gaming rigs, and while it's still enough to play most games in 2025, many games will consume much more than that if you let them. It might feel like a luxury to have more than 16, but if your games are routinely taking up 10+ GB of RAM during gameplay, that's a sign that it just might be time for an upgrade.

What's the sweet spot?

It depends on your work

For gaming, the answer is pretty straightforward: 32 GB is the new 16. Modern titles will easily use more than 16 GB of RAM if it's available to them, but not much more than that. 32 GB is a nice round number, and it's relatively inexpensive to boot.

For work, it's slightly more complicated. The answer is that it largely depends on what sort of work you plan on doing. 64 GB really only makes sense if you're running more than a couple of virtual environments, working with excessively large datasets locally, or working with ultra-high resolution media. 32 GB is probably the sweet spot for most users, as it gives them the flexibility they want during work, while still being more than enough for gaming. Speed is noteworthy too, although every CPU and platform will be different. If you're upgrading an existing kit, try to buy the same make and model. Mixing and matching doesn't always lead to issues, but I've had better luck upgrading like-for-like.

Upgrade with intent

RAM upgrades can absolutely transform performance, but only when memory is the thing holding you back. If your system never touches the limits of what’s installed, adding more won’t speed anything up; it’ll just lighten your wallet. Before you throw more DIMMs in your system, check to make sure something else isn't the true bottleneck. If you find out it really is RAM that's holding you back, an upgrade will make a massive difference.