Memory

DDR4 vs DDR5

DDR5 offers higher bandwidth and is required for the latest Intel and AMD platforms. DDR4 is still widely available and more affordable. Check your motherboard specs — it supports one or the other, not both.

JEDEC DDR5 Standards

How Much RAM Do You Need?

16GB is the minimum for modern gaming PCs. 32GB gives comfortable headroom for multitasking and content creation. 64GB is only needed for professional workloads like video production, large datasets, or running virtual machines.

Speed & Latency

RAM speed (measured in MHz) and CAS latency (CL) both affect performance. For DDR5, 5600–6000 MHz at CL30–36 is a good target. For DDR4, 3200–3600 MHz at CL16 offers excellent value. Enable XMP/EXPO in your BIOS to run at rated speeds.

Dual Channel vs Single Channel

Always install RAM in pairs to enable dual-channel mode, which doubles the memory bandwidth available to your CPU. A single 16GB stick will perform noticeably worse than two 8GB sticks in tasks like gaming and content creation. Check your motherboard manual for the correct slots to populate — most boards recommend slots 2 and 4 (counting from the CPU) for a two-stick configuration to ensure optimal signal routing.

RGB & Heatspreaders

RAM heatspreaders help dissipate heat on high-speed kits that run at elevated voltages, which can improve stability during sustained workloads. RGB lighting is purely cosmetic and adds £10–20 to the price of a kit. If your build has a window and you enjoy the aesthetics, go for it. If you are building on a tight budget, non-RGB kits with the same speed and latency specs perform identically and leave more money for components that affect real-world performance.

Upgrade Considerations

If you think you might want more RAM in the future, plan your initial purchase accordingly. Buying a 2x8GB kit leaves two DIMM slots free on a standard ATX motherboard for later expansion to 32GB. Starting with a 2x16GB kit is usually better value than buying 4x8GB, as it keeps upgrade paths open. Also confirm your motherboard and CPU support the total capacity you are targeting — some entry-level platforms cap out at 64GB or 128GB.

Compatibility Checking

Not all RAM kits work perfectly with every motherboard and CPU combination. Motherboard manufacturers publish Qualified Vendor Lists (QVLs) that confirm which specific memory kits have been tested and verified to work at their rated speeds. While unlisted kits often work fine, consulting the QVL is especially important for high-speed DDR5 kits where compatibility can be less predictable. If you experience instability, running RAM at a slightly lower speed or adjusting timings manually in the BIOS usually resolves the issue.

ECC vs Non-ECC Memory

Error-correcting code (ECC) memory detects and fixes single-bit errors automatically, which is critical for servers, workstations, and systems that handle sensitive data. Most consumer platforms do not support ECC, but AMD Ryzen does offer unofficial ECC support on many boards. For a standard gaming or productivity PC, non-ECC memory is perfectly fine. If you run a home server, handle large databases, or do professional work where silent data corruption is unacceptable, ECC is worth investigating for the modest price premium.

When to Buy RAM

Memory prices are influenced by supply cycles in the semiconductor industry, meaning they can swing significantly over the course of a year. Tracking prices over several weeks before purchasing helps you identify whether current pricing is favourable or inflated. Major sales events like Black Friday and Amazon Prime Day frequently feature competitive RAM deals. If your build is not urgent, patience can save you £20–40 on a kit — money better spent on a faster SSD or a better CPU cooler.