DDR4 Server Memory

JH-E4 / R4 / L4 · ECC UDIMM / RDIMM / LRDIMM · 3200 MT/s

JH Semiconductor DDR4 server memory — ServerCore RDIMM (JH-R4), EntryECC UDIMM (JH-E4) and ServerDensity LRDIMM (JH-L4), 3200 MT/s, 16 GB–128 GB, with fixed BOM and 100% burn-in, for legacy servers, domestic-CPU replacement, databases and high-capacity virtualization. 5-year warranty.

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Product Models

DDR4 ECC RDIMM

Capacity

16 / 32 / 64GB

NAND

DDR4

Seq Read

3200 MT/s

Seq Write

3200 MT/s

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DDR4 ECC RDIMM

JH ServerCore DDR4 ECC RDIMM (JH-R4), 3200 MT/s, 16/32/64 GB, standard data-center fixed BOM and a launch main line for legacy servers, databases, virtualization and domestic-CPU replacement.

DDR4 · 16 / 32 / 64GBECC RDIMM3200 MT/s

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DDR4 ECC UDIMM

Capacity

16 / 32GB

NAND

DDR4

Seq Read

3200 MT/s

Seq Write

3200 MT/s

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DDR4 ECC UDIMM

JH EntryECC DDR4 ECC UDIMM (JH-E4), 3200 MT/s, 16/32 GB, supplied per motherboard ECC-UDIMM QVL for entry servers, workstations and NAS; not mixable with RDIMM.

DDR4 · 16 / 32GBECC UDIMM3200 MT/s

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DDR4 (3DS) LRDIMM

Capacity

64 / 128GB

NAND

DDR4

Seq Read

3200 MT/s

Seq Write

3200 MT/s

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DDR4 (3DS) LRDIMM

JH ServerDensity DDR4 LRDIMM (JH-L4), 3200 MT/s, 64/128 GB (incl. 3DS), for high-capacity DDR4 platforms, in-memory databases and virtualization; only for LRDIMM-capable platforms, qualified per server model.

DDR4 · 64 / 128GBECC LRDIMM (incl. 3DS)3200 MT/s

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Specification Comparison

Model	Type	Interface	Capacity	Key Specs
DDR4 ECC RDIMM	DDR4	ECC RDIMM	16 / 32 / 64GB	3200 MT/s
DDR4 ECC UDIMM	DDR4	ECC UDIMM	16 / 32GB	3200 MT/s
DDR4 (3DS) LRDIMM	DDR4	ECC LRDIMM (incl. 3DS)	64 / 128GB	3200 MT/s

DDR4 ECC RDIMM

Type: DDR4

Interface: ECC RDIMM

Capacity: 16 / 32 / 64GB

3200 MT/s

DDR4 ECC UDIMM

Type: DDR4

Interface: ECC UDIMM

Capacity: 16 / 32GB

3200 MT/s

DDR4 (3DS) LRDIMM

Type: DDR4

Interface: ECC LRDIMM (incl. 3DS)

Capacity: 64 / 128GB

3200 MT/s

Fixed base model: model numbers do not change with DRAM/RCD/PMIC vendors; supply variants use only G/D and hardware-revision suffixes

Fixed BOM: no mixing of dies, RCD, PMIC or PCB within one order/batch; any change goes through PCN

G-then-D: international-vendor BOM closes compatibility and delivery first; localized BOM is qualified in parallel and released as the D version

Platform QVL: every "Intel/AMD/domestic-CPU compatible" claim maps to a specific server/board model and test record

100% inspection, per-module burn-in and batch traceability, 5-year limited warranty

Specifications as of 2026-09-24; see each model page and the official product guide for details.

Frequently Asked Questions

Which DDR4 module types and capacities are offered?

Three, all 3200 MT/s and 288-pin: ECC RDIMM (JH-R4, 16/32/64 GB), ECC UDIMM (JH-E4, 16/32 GB) and (3DS) LRDIMM (JH-L4, 64/128 GB).

How do I choose between RDIMM, ECC UDIMM and LRDIMM?

Choose RDIMM (JH-R4) for legacy servers, databases and domestic-CPU replacement; ECC UDIMM (JH-E4) for entry servers, workstations and NAS per board QVL, never mixed with RDIMM; LRDIMM (JH-L4) only on platforms that explicitly support it.

Which platforms are supported and what is the warranty?

Intel Xeon, AMD EPYC and domestic DDR4 platforms, with compatibility tied to specific server/board QVLs and test records; fixed BOM, 100% inspection and burn-in, with a 5-year limited warranty on JH-R4 and JH-E4 and 3 years on JH-L4.

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