Statements about Intel XMP, AMD EXPO, NVM Express and Microsoft DirectStorage below were checked against the makers’ own pages on November 6, 2026. Statements attributed to Kingston’s SSD FAQ were read in October 2026 and could not be reopened on November 6. Gimaxo has not tested any memory or storage. Products, versions and policies change, so confirm the current details with the maker and your retailer before you buy.

RAM and storage do different jobs. RAM holds the data a game and the rest of your system are working with right now. Storage holds the game files and affects how quickly they can be read. Whether upgrading either one changes your frame rate or loading times depends on the game, on the rest of your PC and on what is actually limiting it. This guide covers compatibility, capacity and how to read the specifications, so that the parts you buy work together. What memory profiles change in games is the subject of our separate guide to memory profiles and gaming performance.

Photo: ITEagle Europe - Sebastiaan Broekhoven, CC BY-SA 4.0, resized and converted (see Image credits). The two sides of one DDR5 desktop memory module, shown as an example of what a module looks like. Not tested or chosen by Gimaxo.

Start with what your system supports

Processor, motherboard and memory type

Compatibility comes before speed. Three things decide which memory will work:

• The processor. Processor makers list the memory type and speeds each model supports on its product page, and the figure can depend on the number of modules. AMD’s page for the Ryzen 7 9800X3D, read on November 4, 2026, lists a maximum of DDR5-5600 with two modules and DDR5-3600 with four, in the configurations it cites. Intel’s page for the Core Ultra 9 285K lists “Up to DDR5 6400 MT/s”. These are the makers’ ratings for those processors. They do not say what speed your PC runs at when it starts, because that also depends on the kit’s stored settings and on your board’s BIOS.
• The motherboard. The board maker’s memory support list shows which kits have been tested, and the board may need a recent BIOS version for some memory. DDR4 and DDR5 are different memory types and are not interchangeable, so confirm which one your board supports.
• The modules. Check the type, the kit capacity, the rated speed and timings, and which profiles the kit lists (XMP, EXPO or both).

The number of modules can also matter. Supported speeds can differ between two modules and four, as the AMD example above shows, so check the board’s memory support list for the configuration you plan to use rather than assuming a kit’s rated speed applies in every setup.

Capacity

There is no single amount that suits every PC. Look at the RAM and storage listed in the requirements for the games you play, which are usually on the store page or the publisher’s site. Then allow for what runs alongside the game, such as a browser, voice chat or capture software, and for the way you use the machine for work or content creation.

Check your motherboard manual for its memory channel layout and which slots to populate. Fewer, larger modules leave slots free for adding memory later, but check the board’s list before relying on a particular layout.

Read speed and timing figures for what they are

Data rate

DDR5 kits are sold by data rate in MT/s, such as DDR5-6000 or DDR5-6400. A higher data rate means a higher theoretical peak transfer rate. For example, 6400 MT/s is about 78% more than 3600 MT/s (6400 ÷ 3600 ≈ 1.78). That is arithmetic on two theoretical ceilings, not a prediction of how much faster a game will run. How much a game benefits depends on the game, the processor and the rest of the system, so look for independent reviews that test the processor and games you care about.

CAS latency

CAS latency (CL) is counted in memory clock cycles, so the number alone does not compare across kits with different data rates. You can convert it to a theoretical time in nanoseconds. The kits below are examples for the calculation, not recommendations:

CAS latency in ns = CAS × 2000 ÷ data rate in MT/s

Kit	Calculation	Theoretical CAS latency
DDR5-6000 CL30	30 × 2000 ÷ 6000	10.0 ns
DDR5-6400 CL32	32 × 2000 ÷ 6400	10.0 ns
DDR4-3600 CL16	16 × 2000 ÷ 3600	about 8.9 ns

This is arithmetic, not measurement. It gives the theoretical CAS latency only. It is not the total memory latency of a system, and it does not tell you which kit will be faster in a game.

XMP and EXPO as compatibility labels

A memory kit’s rated speed and timings are usually stored as a profile that the motherboard BIOS can apply. Intel’s version is XMP and AMD’s is EXPO. Both makers describe them as memory overclocking. Intel says altering frequency or voltage outside its specifications may void the processor warranty, and names enabling XMP as an example. AMD says operating outside its published specifications will void its product warranty. Read their terms before you enable a profile. The details are in our guide to memory profiles and gaming performance.

For compatibility, the makers say three things:

• Intel says its Core Ultra and Core K-series desktop processors work with XMP on motherboards that support it. It advises confirming the board with its manufacturer and checking whether the memory module is Intel XMP certified.
• AMD publishes a memory compatibility list. It shows which kits AMD tested to run at rated speed and latency, and whether each supports EXPO, carries the EXPO Ultra Low Latency certification or is compatible with XMP.
• A profile does not guarantee the rated speed on your board. If a system is unstable after you enable one, check the board’s memory support list and BIOS version before assuming the kit is faulty.

Storage

SSD interfaces

2.5-inch SATA SSDs connect with a SATA data cable and also need a power cable. M.2 is a drive format, not an interface. M.2 drives fit directly into a slot on the motherboard, and Kingston’s SSD FAQ says no power or data cables are needed. The same FAQ says M.2 supports both SATA and PCIe storage interface options, so an M.2 SSD uses one or the other depending on the model, and your slot has to support the one your drive uses. NVM Express, the consortium that develops the NVMe specification, describes NVMe as the register interface and command set for storage attached over PCI Express, so an M.2 NVMe drive is a PCIe drive in the M.2 format. Your board’s manual lists which M.2 slots it has and which interface and PCIe generation each supports, and a drive’s rated speed can only be reached if the slot supports it. Manufacturer speed ratings are usually quoted under specific test conditions, so treat them as a way to compare drives, not as a promise of faster game loading. How quickly a game loads depends on the game and on the rest of your system as well.

What DirectStorage is

DirectStorage is Microsoft’s API for loading game assets. It only helps in games that implement it, so check the game’s own notes.

Microsoft’s downloads page lists DirectStorage versions starting at 1.0. GPU decompression using GDeflate was introduced with version 1.1, and the page lists later versions, including 1.3.0 and a 1.4.0 preview build, when this article was checked. Microsoft’s 2022 post on 1.1 states that:

• GPU decompression is supported on DirectX 12 GPUs with Shader Model 6.0.
• Developers are told to encourage players to install games on NVMe SSDs for the best experience.
• A request is eligible for GPU decompression only when its destination is a Direct3D 12 resource. Otherwise the CPU decompresses it.
• Developers can turn GPU decompression off globally, for example for systems that have a significantly faster CPU than GPU.

Microsoft’s post does not give a figure for how much faster loading becomes, and neither does this guide. Whether it helps on your PC depends on the game and your hardware.

Capacity and drive choice

Install sizes vary widely from one game to the next, and they can grow with updates, so check the size on the store page and leave room for patches and for the games you plan to add. An SSD is generally the better home for games you play often. A hard drive can still be a sensible place for files you rarely open, but check the game’s requirements before installing it there, because some list an SSD as required or recommended.

Checklist before you buy

1. Check the processor’s product page for the supported memory type and speeds, and how they depend on the number of modules.
2. Check the motherboard’s memory support list and BIOS version for the exact kit and the number of modules you plan to use.
3. Check the game requirements for the RAM and storage you need.
4. Compare kits using data rate and CAS latency together, and use independent reviews of your processor and games for real-world results.
5. If you plan to enable XMP or EXPO, read the warranty terms of your processor maker first.
6. Check your motherboard’s M.2 slots and the PCIe generation each supports before choosing an NVMe drive.
7. Check whether the games you care about use DirectStorage before counting on it.

Summary

• Start from what the processor and motherboard support, not from a single recommended speed.
• Data rate and CAS latency describe the memory, not your frame rate. Use independent reviews for real-world results.
• XMP and EXPO are the makers’ memory overclocking profiles, and Intel and AMD each state their own warranty position.
• DirectStorage depends on the game. GPU decompression arrived with version 1.1, and later versions exist.
• Check slot support and game requirements before you buy storage.

To find out whether more memory or faster storage would change your frame rate at all, start with our gaming PC performance guide.

Image credits

The photo in this guide is by ITEagle Europe - Sebastiaan Broekhoven and is licensed under the Creative Commons Attribution-ShareAlike 4.0 International license (CC BY-SA 4.0). License text: https://creativecommons.org/licenses/by-sa/4.0/. The license notice is the one given on the photo’s page on Wikimedia Commons.

• “SK hynix 16GB DDR5-5600 UDIMM HMCG78AGBUA084N BA”, taken June 25, 2026. Source: https://commons.wikimedia.org/wiki/File:SK_hynix_16GB_DDR5-5600_UDIMM_HMCG78AGBUA084N_BA.jpg

Changes made by Gimaxo: the file was resized and converted to WebP, and the site shows it cropped to fit the page layout. Nothing else was altered apart from removing embedded metadata. The adapted file is shared here under the same license, CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), and anyone who reuses it must keep the credit above and the same license. The rest of this guide is not covered by that license. The creator does not endorse this guide. The brand name on the module belongs to its owner and is not licensed by this notice.

Sources

Named here as plain text.

• Intel, Extreme Memory Profile (XMP) page and FAQ (read November 6, 2026)
• Intel, Core Ultra 9 processor 285K specifications page (read November 6, 2026)
• AMD, EXPO Technology for Socket AM5 page, with its memory compatibility list (read November 6, 2026)
• AMD, Ryzen 7 9800X3D desktop processor page (read November 4, 2026)
• NVM Express, About page (read November 6, 2026)
• Microsoft DirectX Developer Blog, DirectStorage API downloads and “DirectStorage 1.1 now available” (read November 6, 2026)
• Kingston, SSD FAQ (UK) (read October 2026)