How much RAM do you need for Windows 11?

How much RAM, by what you do

Web browsers are the biggest memory users for most people. Each open tab takes memory, and sites like Gmail, Facebook, and YouTube take a lot. If you tend to leave 30 tabs open, plan on 16 GB.

How much do you have?

1. Press Ctrl+Shift+Esc to open Task Manager. Click More details if it opens small.
2. Go to the Performance tab and click Memory.
3. The total is at the top right. Below the graph you'll see Slots used (like "1 of 2") and Form factor (SODIMM means laptop-size).

Task Manager doesn't show the memory type, which you need if you're buying more. The free program CPU-Z shows it on its Memory tab: DDR3, DDR4, or DDR5.

Is it enough? Watch it for a day

The table is a starting point. Your own PC will tell you for sure. Leave Task Manager open on the Memory graph while you work normally.

• Usually under 70%: you have enough. More memory won't make it faster.
• Often 80 to 90% or higher, and things slow down when you switch between programs: you're running short. More memory will help.
• Memory is fine but the PC is still slow: the cause is somewhere else. This 10-minute diagnosis will help you find it.

Windows uses spare memory to cache things you might need, so it's normal to see it fairly full. It's the slowdowns that tell you it's too little, not the number alone.

Watch for soldered memory when buying a laptop

On many thin laptops, some or all of the memory is soldered to the board and can't be upgraded. Whatever it ships with is what it has forever. Look for "soldered" or "onboard" in the specs, or search the model name plus "RAM upgrade."

If it's soldered, buy 16 GB up front. With memory prices where they are in 2026, a model that already has 16 GB is usually a better deal than planning to add it later. That goes for refurbished laptops too, where models like the ThinkPad T490 and X280 have soldered memory.

Adding more to the PC you have

Most desktops, and most laptops from before about 2018, have slots you can add memory to. To buy the right stick, match what's already there:

• Type: DDR3, DDR3L, DDR4, or DDR5. They don't mix, and they won't fit each other's slots.
• Size: SODIMM for laptops and mini PCs, full-size DIMM for regular desktops.
• Speed: ideally the same, like DDR4-2666. If it's different, both sticks run at the slower speed, which is fine.

If there's an empty slot, add one matching stick. If both slots are full of small sticks, like two 4 GB, you'll have to replace them with bigger ones. Your model's hardware maintenance manual or spec sheet lists the maximum it supports. My speed-up guide covers the upgrade, and my RAM price tracker has current $/GB prices for laptop and desktop memory. Used memory is a good way to save, since it rarely wears out.

On an old laptop, keep an eye on the math. Older DDR3 memory is still cheap, but if an upgrade costs more than about $100, a newer refurbished PC with 16 GB may make more sense.

Which helps more, RAM or an SSD?

If your PC still has a spinning hard drive, get the SSD first. An old hard drive is the most common reason a PC feels slow, and no amount of memory makes up for it. My guide to cloning to an SSD shows how to switch without reinstalling anything.

Already have an SSD? Then memory is the next thing to look at, and the Task Manager check above tells you whether you need it.