Memory
Memory covers RAM for almost anything with a DIMM slot. That includes registered and load-reduced server modules, unbuffered desktop DIMMs, laptop SO-DIMMs, HP LaserJet memory, RAID controller cache modules, Cisco router and firewall DRAM, and the risers and carriers that hold DIMMs in larger servers. Generations run from early SIMMs through DDR3 and DDR4 to current DDR5, with OEM parts from HPE, Dell and HP alongside modules made by Samsung, SK Hynix, Micron, Nanya and Kingston.
Memory: 36,832 products
Buying guide
Finding compatible memory
Start from the system
The server, PC or printer model fixes the memory generation, module format and maximum capacity. Its documentation is more reliable than comparing modules by eye.
Read an installed module
The label on a module already in the system gives its capacity, speed (for example PC4-25600 or DDR4-3200), rank and type, and on OEM modules a part number you can match exactly.
Know the formats
Servers and desktops use full-size DIMMs, laptops and mini PCs use SO-DIMMs, and printers, routers and RAID controllers each use formats of their own.
Memory
Frequently asked questions
What's the difference between PC4-25600 and DDR4-3200?
They describe the same module from two angles. DDR4-3200 names its transfer rate, 3,200 million transfers a second, while PC4-25600 names its peak bandwidth in megabytes per second: that rate multiplied by the 8-byte width of the module.
Do you carry memory for discontinued systems?
Yes. Alongside DDR4 and DDR5, the department lists DDR3 and DDR2 modules, 72-pin SIMMs for 1990s Compaq Deskpro and HP systems, and memory carriers for HP Integrity rx-series servers.
Is OEM-branded memory different from generic memory?
OEM modules are usually built by Samsung, SK Hynix or Micron and sold under the system maker's part number. A generic module with identical specifications normally runs, but some servers' management tools flag non-OEM memory as unsupported.
