RAM is one of the easiest parts to get wrong, because two sticks can look almost identical and still not fit the same board. This guide explains the difference between DDR4 and DDR5, how much memory you actually need, and how to read RAM listings so you buy the right kit.
DDR4 and DDR5 are not interchangeable
DDR4 and DDR5 have a different notch position, so a DDR5 stick physically won't go into a DDR4 slot. Your motherboard decides which one you use:
| Platform | Memory type |
|---|---|
| AMD AM5 (Ryzen 7000/8000/9000) | DDR5 only |
| AMD AM4 (Ryzen 1000–5000) | DDR4 only |
| Intel LGA1700 (12th–14th gen) | DDR4 or DDR5. Each board supports one, check the name |
| Intel LGA1851 (Core Ultra 200S) | DDR5 |
Not sure about your socket? Read CPU sockets explained first.
How much RAM do you need?
| Capacity | Good for |
|---|---|
| 8GB | Basic office and browsing only. Too little for modern games. |
| 16GB | The minimum for gaming today. Fine for light work and study. |
| 32GB | The sweet spot for gaming in 2026, streaming, and working with many browser tabs open. |
| 64GB or more | 4K video editing, large 3D scenes, virtual machines, heavy multitasking. |
If you can afford it, 32GB is worth it for a new gaming build. Several recent games already use more than 16GB, and RAM is easy to forget when you upgrade later.
Why two sticks beat one: dual channel
Desktop processors read from memory over two channels at once. One stick only uses one channel. Two matching sticks (for example 2 × 16GB) give you dual channel, which can noticeably improve performance in games and especially with integrated graphics.
- For two sticks, use the slots your motherboard manual recommends, usually A2 and B2.
- Four sticks can work, but DDR5 often has to run slower with four, and it's harder to reach the rated speed. Two larger sticks are usually the better choice.
- Mini-ITX boards have only two slots. Our builder warns you if you choose more sticks than the board can take.
Speed vs latency: what the numbers mean
A RAM listing like "DDR5-6000 CL30" tells you two things:
- Speed (MT/s): how many transfers per second. Higher is better. Typical speeds are 3200–3600 for DDR4 and 5600–6400 for DDR5.
- CAS latency (CL): how many clock cycles it takes to respond. Lower is better.
To compare kits fairly, calculate the true latency in nanoseconds: CL × 2000 ÷ speed. DDR4-3200 CL16 works out to 10ns, and DDR5-6000 CL30 is also 10ns, but the DDR5 kit moves far more data per second. That's why DDR5 is faster overall even though its CL numbers look higher.
Turn on XMP or EXPO, or you won't get the speed you paid for
RAM runs at a slow default speed until you enable its profile in the BIOS: XMP on Intel and many AMD boards, EXPO on AMD. It's a single setting. Without it, a DDR5-6000 kit may run at 4800 MT/s. Enable it on the first boot, then check the speed in Task Manager → Performance → Memory.
Buy a matched kit
A kit ("32GB (2×16GB)") is two sticks tested together at the rated speed. Buying two separate single sticks of the same model usually works, but it isn't guaranteed, especially at high DDR5 speeds. If you can, buy the kit. In our builder you can filter RAM by number of sticks, or add a single stick and use the quantity control to take two.
Things to avoid in RAM listings
- SO-DIMM / "laptop RAM" is the small laptop format and won't fit a desktop board.
- ECC, RDIMM or "server" memory is for servers and workstations. Normal desktop boards need non-ECC "UDIMM" (some listings say "Non-ECC", which is the right one).
- DDR3 is only for very old PCs. No current motherboard uses it.
- Mixing different kits can force all sticks down to the slowest speed, or fail to boot.
RGB lighting doesn't affect performance, so only pay for it if you want the look.
Frequently asked questions
Is DDR5 worth it over DDR4?
If you're buying a new AM5 or LGA1851 platform, you have no choice: they're DDR5 only. On LGA1700, a DDR4 board with DDR4 RAM saves money. DDR5 is faster, but the difference in games is modest compared to upgrading the graphics card.
Is 16GB enough for gaming?
It works, but 32GB is the safer choice for a new gaming PC in 2026, especially if you keep Discord, a browser and other apps open while you play.
Can I add more RAM later?
Yes, but adding a different kit can cause instability or lower speeds. Buying the capacity you need at the start, as one kit, is the most reliable approach.
Does RAM speed matter for gaming?
Somewhat, especially on AMD, and when a game is limited by the CPU. Going from DDR5-4800 to 6000 is worthwhile. Going far beyond 6400 brings smaller gains for the extra cost.