RAM Upgrade:
How Many GB Are Enough and How to Choose?

First, do you actually need an upgrade?

The answer to this question is given by measurement, not by guesswork. Open Task Manager and Performance → Memory tab and during your normal usage observe the following:

• If usage is constantly above 80% and if the "Paged pool" is growing, the system memory is not sufficient and is overflowing to the disk. An upgrade makes a very clear difference here.
• If usage is in the 50-60% band RAM is not the bottleneck. The cause of the slowness is most probably the disk; if you are still using a mechanical disk, switching to an SSD makes a far greater difference than adding RAM.

This distinction matters: with a proportion of the devices brought to us with the request “my computer is slow, let’s fit more RAM”, the real bottleneck turns out to be the drive rather than the memory. Upgrading the wrong part not only fails to solve the problem but also uses up the budget. The other causes of slowness in a separate guide we have compiled.

Capacity according to usage

For the general user, 16 GB is a balanced choice today. However, “the more the better” is not correct: if the system uses half of 16 GB, fitting 32 GB produces no difference in speed at all, you are merely adding unused capacity.

The four conditions of compatibility

1. DDR generation

The module must be from whichever generation your mainboard supports. The notches of DDR4 and DDR5 modules are in different positions; the wrong generation will not physically fit into the slot. Skipping this check is the most common purchasing mistake.

2. Form factor

Desktop computers DIMM, laptops SO-DIMM is used. SO-DIMM is shorter and does not fit into a desktop slot. Always verify this distinction on the product page.

3. Speed and motherboard support

If you fit a module faster than the mainboard supports, the system will work, but the module will drop to the speed the mainboard supports. In other words, the extra speed you paid for is not used. On the other hand, in order to reach the advertised high speeds, in the BIOS XMP (Intel) or EXPO The (AMD) profile must be enabled; if this is not done, the module runs at the default low speed and you will not see the performance you paid for.

4. The risk of soldered memory in laptops

The memory of thin laptops and of all modern MacBooks is soldered to the mainboard; it cannot be upgraded. Before buying, be sure to verify whether your device has an upgradable slot. In some models part of the memory is soldered while one slot is free; in that case only that slot can be used.

Dual channel: the overlooked gain

When the memory controller works with two modules, the data bus becomes wider. In practice this means the following: 2x8 GB is faster than a single 16 GB module. The difference is particularly noticeable on systems that have no discrete graphics card and use integrated graphics, because integrated graphics use the system memory and depend directly on bandwidth.

For that reason, when upgrading, choose a two-module kit where possible instead of a single large module. If your mainboard has four slots, the manual states which two of them form the dual channel — usually the first and third or the second and fourth slot. Fitting the modules in the wrong slots disables the dual channel, and this is a loss of performance that is invisible to the eye but measurable.

Adding to the existing module

When you have 8 GB, adding a further 8 GB on top of it looks tempting and works most of the time. However, what needs to be known is this: the system runs at the speed of the slowest module fitted, and modules from different production batches may produce instability when used together.

If you experience blue screens, freezes or random restarts after the upgrade, the first suspect is memory incompatibility. In such a case you can find the faulty one by testing the modules one by one; for the steps, see our blue screen guide may be consulted.

Points to observe during installation

• Unplug the device and, on a laptop, also disconnect the battery.
• Touch a metal surface to discharge static electricity; do not hold the module by the gold contact surfaces.
• Align the module by the notch and until the clips close of their own accord press it down. A module that is only half seated is the most common cause of a computer that will not start.
• After installation, check in the BIOS that the total capacity is shown correctly.
• If you have bought a high-speed kit, remember to enable the XMP/EXPO profile in the BIOS.

Let us choose the correct module

We can determine together the memory that suits your mainboard model and your current configuration. Once you send us your device details, we tell you which modules are compatible and, if you wish, we also carry out the installation and the BIOS settings at our workshop. We run a stability test after the upgrade as standard — what matters is not merely that the module is detected, but that it works flawlessly under load.