What is the difference between RDIMM and LRDIMM?

RDIMM (Registered DIMM) is the standard for most enterprise servers. LRDIMM (Load-Reduced DIMM) supports higher memory density per slot and is used in servers requiring very large memory configurations.

DDR5 ECC Server Memory UK | 16GB 32GB 64GB RDIMM | VeriLicense

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In stock — UK supplier

DDR5 ECC server memory for UK businesses

Q: Is DDR5 backwards compatible with DDR4?

No. DDR5 uses a physically different slot and is not backwards compatible with DDR4. Your server must have DDR5-capable memory slots.

Q: What DDR5 speeds are available?

VeriLicense supplies DDR5-4800, DDR5-5600 and DDR5-6400 modules. DDR5-5600 is the most widely supported enterprise speed.

RDIMM and LRDIMM DDR5 ECC modules in 16GB, 32GB and 64GB. Compatible with HPE ProLiant, Dell PowerEdge and Lenovo ThinkSystem. Same-day quotes, volume pricing available.

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DDR5 ECC modules — in stock

DDR5-4800 RDIMM 16GBIn stock

DDR5-5600 RDIMM 32GBIn stock

DDR5-5600 RDIMM 64GBIn stock

DDR5-6400 LRDIMM 64GBIn stock

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Why DDR5 ECC

The next generation of server memory

DDR5 delivers double the bandwidth of DDR4, on-die ECC for improved reliability, and higher density — making it the standard for modern enterprise workloads.

2× the bandwidth

DDR5 delivers up to 6400 MT/s compared to DDR4’s 3200 MT/s maximum. Faster memory bus means better performance for data-intensive workloads.

On-die ECC

DDR5 includes on-die error correction as standard, catching single-bit errors before they reach the memory controller. Critical for database and virtualisation workloads.

Higher density

DDR5 supports up to 128GB per DIMM on current platforms, allowing larger memory configurations in the same number of slots.

Specifications

Available modules

All modules are genuine ECC-registered, sourced from authorised distribution. Contact us for configurations not listed below.

Module	Type	Speed	Capacity	Compatible with
DDR5-4800 RDIMM	RDIMM ECC	4800 MT/s	16GB / 32GB	HPE ProLiant Gen11, Dell PowerEdge
DDR5-5600 RDIMM	RDIMM ECC	5600 MT/s	16GB / 32GB / 64GB	HPE ProLiant Gen11, Dell R750, Lenovo SR650
DDR5-6400 RDIMM	RDIMM ECC	6400 MT/s	32GB / 64GB	Latest Gen11/Gen12 platforms
DDR5-5600 LRDIMM	LRDIMM ECC	5600 MT/s	64GB / 128GB	High-density configs, HPE Gen11

Not sure which module is right for your server? Use our free DDR5 compatibility checker or contact us at sales@verilicense.co.uk — we’ll confirm the right spec for your exact server model.

Compatibility

Supported server platforms

DDR5 ECC memory requires a server platform with DDR5-capable memory slots. The major platforms we supply for are listed below.

HPE ProLiant

Gen11 servers (DL360, DL380, ML350 and more) support DDR5. Gen10 and earlier are DDR4 only. Check your iLO or server QuickSpecs for confirmation.

Dell PowerEdge

The R750, R760, R860 and R960 series support DDR5 on Intel Sapphire Rapids and Emerald Rapids platforms. Verify via Dell’s memory configuration tool.

Lenovo ThinkSystem

SR630 V3, SR650 V3 and SR850 V3 support DDR5. Use Lenovo’s ServerProven tool or contact us to confirm compatibility for your model.

DDR4 servers are not compatible with DDR5. DDR5 uses a physically different slot (288-pin, different key position) and runs at a different voltage. Attempting to install DDR5 in a DDR4 slot is not physically possible.

RDIMM vs LRDIMM

Which module type do you need?

Feature	RDIMM	LRDIMM
Best for	Most enterprise servers	High-density / large-memory configs
Max capacity per slot	64GB (DDR5)	128GB (DDR5)
Performance	Slightly higher	Slightly lower at low rank counts
Cost	Lower	Higher
Availability	Widely available	More limited
Recommendation	Default choice	Only when density requires it

FAQ

Common questions

Is DDR5 backwards compatible with DDR4? +

No. DDR5 uses a different physical slot, different voltage and a different memory controller interface. DDR5 modules cannot be installed in DDR4 slots and vice versa. Your server must natively support DDR5.

What is DDR5 ECC and why does it matter? +

ECC (Error-Correcting Code) memory automatically detects and corrects single-bit memory errors. For servers running databases, virtualisation or financial workloads, ECC is essential to prevent data corruption. All enterprise server memory should be ECC.

RDIMM vs LRDIMM: which do I need? +

RDIMM is the correct choice for the vast majority of enterprise servers. LRDIMM is only needed when you require very high memory density (128GB+ per slot) and your server explicitly supports it. When in doubt, choose RDIMM.

What DDR5 speeds are available? +

We supply DDR5-4800, DDR5-5600 and DDR5-6400. DDR5-5600 is the most widely supported enterprise speed. Always check your server’s maximum supported speed — installing a faster module than the server supports results in it running at the server’s maximum, not the module’s rated speed.

Can I mix DDR5 speeds in the same server? +

Technically possible on most platforms, but not recommended. When mixing speeds, all modules run at the speed of the slowest installed module. For best performance and stability, use matching modules throughout.

Do you offer volume pricing? +

Yes — volume pricing is available for MSPs, IT resellers and enterprise customers ordering multiple modules or across multiple servers. Contact sales@verilicense.co.uk with your requirements for a tailored quote.

Ready to get a quote?

Contact the VeriLicense team for pricing, compatibility advice and volume orders.

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Or email directly: sales@verilicense.co.uk