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Then you should consider replacing your existing HDD with an SSD(solid state drive)

Upgrading the memory in your computer is usually the first step to increasing it's performance. Additional memory allows you to run more applications simultaneously without the computer slowing down. It also allows you to multi-task to a much greater degree as your applications, email, web browsing, etc. all have more RAM to use to run efficiently.

However additional RAM does not solve all the issues of a "slow" computer. If you find that it takes the latest OS a long time to load or your spreadsheets are taking minutes before they are ready to use, then you should consider swapping out your old spinning HDD for an SSD.  

SSDs will run up to 12 times faster then a HDD and will have the OS loading and ready to use within seconds instead of minutes. All complex programs, high res video, complex audio and other large applications will load, ready to use, within seconds instead of taking several minutes before being ready to utilise.  

In a working environment, waiting minutes each time a new program loads or for your computer to be ready to use, is a time consuming and costly exercise. Added up, wait times increase to hours lost when totaled over the course of just a week. 

None of us here have that kind of time to waste, do you?

This would rank as one of our most frequently asked questions.

The short answer is yes.

Most Lenovo desktops have 2 or 4 memory slots that are upgradeable. Many times they are shipped with a matching pair. However when upgrading you need only to add one module at a time regardless whether the device was shipped with 1 module or 2 originally. Your Lenovo desktop will run quite happily with 3 modules assuming it has 4 or more memory slots.

This is by far the most frequently asked question we field on a daily basis.

The answer is always, "what is the exact model of your Lenovo"

Unfortunately there is no other way to determine the answer to that question without knowing the exact details of your computer.

Over ten years ago, 4gb was maximum for most notebooks and desktops. 8 years ago, the max was mostly around 8gb for notebooks and maybe 16gb for desktops. 6 years ago, generally most laptops could take 16gb and many desktops could take 32gb. 

Now with DDR4 RAM, many notebooks take 32gb and many desktops take 64gb.

However those are very rough guidelines as you would need to exclude servers, ultrabooks and other devices from these generic guestimations.

So getting back to our original answer, the only way to receive the correct advice is to be sure to have your exact model available.