DDR4 Server Memory — ECC RDIMM & LRDIMM

The most widely deployed server memory — DDR4-2133 through DDR4-3200

About DDR4 Server Memory

DDR4 ECC memory remains the most widely deployed server RAM on the planet. The vast majority of production servers — Dell PowerEdge 13th/14th/15th gen, HP ProLiant Gen9/Gen10/Gen10+, Lenovo ThinkSystem SR series, and Supermicro X11/X12 platforms — all run DDR4. Whether you are expanding an existing cluster or replacing failed DIMMs, we stock every DDR4 server configuration from 8 GB to 128 GB.

Server DDR4 comes in two main types: RDIMM (Registered) for up to 64 GB per module with moderate density, and LRDIMM (Load-Reduced) for 64-128 GB per module when you need maximum capacity. The key difference is that LRDIMMs use a data buffer chip that reduces electrical load, allowing more DIMMs per channel at higher capacities.

DDR4 Server Memory by Speed

DDR4-2133 (PC4-17000) — Gen9 / 13th Gen servers (E5-2600 v4)
DDR4-2400 (PC4-19200) — Gen9 late / early Gen10 (Xeon Scalable 1st gen)
DDR4-2666 (PC4-21300) — Gen10 / 14th Gen mainstream (Xeon Scalable 2nd gen)
DDR4-2933 (PC4-23400) — Gen10 / 14th Gen high-perf (Xeon Scalable 2nd/3rd gen)
DDR4-3200 (PC4-25600) — Gen10+ / 15th Gen (Xeon Scalable 3rd gen, EPYC 7003)

Bulk pricing available for 10+ modules. Request a quote for cluster-sized memory upgrades with guaranteed matching lot codes for optimal compatibility.

Featured DDR4 Server Memory Products

Browse all 18,823 DDR4 Server Memory SKUs.

Frequently Asked Questions

What is the difference between RDIMM and LRDIMM?

RDIMMs (Registered DIMMs) use a register chip to buffer the address/command signals, available in 8-64 GB capacities. LRDIMMs (Load-Reduced DIMMs) add a data buffer in addition to the register, reducing the electrical load on the memory bus. This allows higher capacities (64-128 GB per module) and more DIMMs per channel. LRDIMMs cost more per GB but enable maximum memory density. You cannot mix RDIMMs and LRDIMMs in the same server.

Can I mix DDR4 speeds in a server?

Technically yes — the server will clock all DIMMs down to the slowest speed. However, this is not recommended for production environments as it wastes the potential of faster modules and can cause subtle stability issues. For best performance and reliability, always use identical DIMMs: same speed, capacity, rank, and ideally the same manufacturer and lot.

How much DDR4 server memory do I need?

For general web/file servers: 32-64 GB. Virtualization hosts (ESXi/Hyper-V): 128-256 GB for 10-30 VMs. Database servers (SQL/Oracle): 128-512 GB depending on dataset size. VDI hosts: 256-512 GB for 20-50 virtual desktops. In-memory databases (SAP HANA): 512 GB to 2 TB. Plan for 4-8 GB per lightweight VM, 8-16 GB per Windows VM, and 2-4× your hot dataset size for databases.