SSD and RAM explained: what do the different sizes and types mean in laptops?

When you start looking for a used laptop , you will immediately notice that each model description contains technical terms: SSD, HDD, DDR3, DDR4, 8 GB, 16 GB, etc. These may seem complicated to a beginner, but in fact, these components determine the speed and reliability of the computer.

In this post, we'll explain the most important: memory types (RAM) and data storage (SSD vs. HDD) .

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1. What is RAM?

RAM (Random Access Memory) is the short-term memory of a laptop, which is used to run open programs and files.

Comparison: Think of RAM as a desk you work on. The larger the desk, the more books and papers you can have open at once - without your work becoming messy or slow.

RAM sizes and compatibility:

4 GB RAM – only suitable for simple tasks (internet, email). These days, it's rather low.

8 GB RAM – ideal for everyday work, studying, and light programs.

16 GB RAM – smooth use of multiple programs at once, also suitable for design and video editing.

32 GB RAM and more – for workstations, professional rendering, and specialized applications.

Different generations of RAM:

DDR3 – older standard, used in older laptops. Lower speed.

DDR4 – common today, faster and more energy efficient.

DDR5 – the latest generation, even faster, used in newer models and workstations.

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2. SSD vs HDD – what's the difference?

Laptops use either an HDD (hard disk drive) or an SSD (solid-state drive) to store data.

HDD (Hard Disk Drive):

Works with a rotating disc, like an old vinyl record.

Cheaper, but slower.

Holds a lot (500 GB – 1 TB and more).

Disadvantages: slow start, noisy, more sensitive to shocks.

SSD (Solid State Drive):

Data is stored on chips, similar to a memory stick.

10x faster than HDD – your computer boots in seconds.

Lighter, quieter and more impact resistant.

More expensive per GB, but prices are dropping quickly.

👉 Nowadays, SSD is a must , especially if you want your computer to be fast and smooth. HDD is more often used as additional memory.

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3. SSD types and connections

Not all SSDs are the same – both form factors and speeds vary.

SATA SSD

Older standard, replacing HDD.

Enough for everyday work.

Speed: ~500 MB/s.

M.2 SATA SSD

Same speed as regular SATA, but in a smaller stick-like form factor.

Used in thinner laptops.

M.2 NVMe SSD

The newest and fastest standard.

Uses PCIe interface, speeds of 2000–7000 MB/s.

Ideal for professional work and handling large files.

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4. How much storage space is needed?

256 GB SSD – enough for everyday work, documents, and some photos.

512 GB SSD – optimal for most users, can hold more images, programs, and documents.

1 TB SSD – suitable if you work with large photos, videos, or want to store a lot of files locally.

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5. Which combination to choose?

Office work and study: 8 GB RAM + 256 GB SSD.

Professional work: 16 GB RAM + 512 GB or larger NVMe SSD.

Gaming or Design: 16–32 GB RAM + fast NVMe SSD (1 TB).

Travel: Rather less storage (256–512 GB), but a lighter device and good battery.

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Summary

RAM and SSD are the two most important components that determine the speed of a laptop. If your computer seems slow, it is usually due to too little random access memory (RAM) or an outdated data storage solution.

The business-class laptops we sell mostly have an SSD drive , which ensures fast boot-up and smooth operation. We also check that the device has enough RAM to meet the expectations of modern programs and users. This means that you get a reliable and fast computer , suitable for work, study, and everyday use.

👉 If you want to know which computer suits your needs, check out our selection of used laptops or contact us – we will help you choose!