HMCG94MEBRA121N: SK hynix 64GB DDR5-4800MHz PC5-38400 ECC Registered CL40 2Rx4 RDIMM Server Memory
Also listed as: HMCG94MEBRA121N-AA, SK hynix 64GB DDR5 RDIMM, HMCG94MEBRA · made by SK hynix
The SK hynix HMCG94MEBRA121N is a high-density 64GB dual-rank (2Rx4) DDR5-4800 ECC Registered memory module engineered for demanding enterprise virtualization hosts, in-memory SAP HANA databases, and AI model caches. Featuring low-power 1.1V operation and JEDEC-compliant on-module power regulation, it guarantees signal stability across fully populated 2DPC server memory channels. In used hardware purchasing, verify SPD checksum integrity, check PCB corners for hairline fractures, and test DIMMs using MemTest86+ before production deployment.
Specifications
| Part number | HMCG94MEBRA121N |
|---|---|
| Brand | SK hynix |
| Made by | SK hynix |
| Type | Memory |
| Other numbers | HMCG94MEBRA121N-AA, SK hynix 64GB DDR5 RDIMM, HMCG94MEBRA |
| Status | current |
| Capacity (GB) | 64 |
| Speed | DDR5-4800 |
| Rank width | 2Rx4 |
| Generation fit | Intel 4th Gen Xeon Scalable and AMD EPYC 9004 series servers |
About the HMCG94MEBRA121N
HMCG94MEBRA121N is SK hynix's high-density 64GB dual-rank (2Rx4) DDR5-4800 registered ECC memory module designed for memory-intensive cloud virtualization and database servers. Operating at 4800 MT/s at 1.1V with CL40 latency, it provides the optimal balance of capacity, bandwidth, and thermal dissipation for multi-tenant hypervisors on Intel Sapphire Rapids and AMD Genoa architectures.
Compatibility
Compatible with enterprise servers supporting DDR5 RDIMMs, including Dell PowerEdge 16G, HPE ProLiant Gen11, Lenovo ThinkSystem V3, and Supermicro servers. Requires an Intel 4th Gen Xeon Scalable or AMD EPYC 9004 series CPU. It cannot be installed in DDR4 slots. Symmetrical population across all memory channels per CPU socket is recommended for maximum interleaving bandwidth.
How to identify a genuine unit
A genuine module displays an SK hynix factory label with part number HMCG94MEBRA121N, 64GB 2Rx4 PC5-4800B-RC0, and a 2D matrix barcode. Both sides of the PCB are populated with SK hynix DRAM dies surrounding an onboard PMIC. In iDRAC, iLO, or XClarity, the module is recognized with SK hynix manufacturer ID.
Buying used
When buying pulled 64GB RDIMMs, test every module under comprehensive memory stress tests. Check the gold edge contacts for scratches or oxidation. Verify that all modules in your order share identical rank structure (2Rx4) to prevent channel downclocking.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 240 (1 sighting, Oct 2026)
Used: USD 160 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 240 | 2026-10-27 | |
| ebay.com | used | USD 160 | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
Equivalent part numbers
- Lenovo 4X77A77496 ThinkSystem 64GB TruDDR5 4800MHz (2Rx4 1.1V) RDIMM ThinkSystem 64GB TruDDR5 4800MHz 2Rx4 RDIMM
- Dell AB949335 Dell 64GB DDR5 4800MHz 2Rx4 RDIMM
FAQ
What rank structure is featured on this 64GB RDIMM?
Dual-rank by 4 (2Rx4).
Is this RDIMM compatible with Intel Sapphire Rapids servers?
Yes, it is fully certified for 4th Gen Intel Xeon Scalable server boards.
Buying or selling HMCG94MEBRA121N?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- SK hynix Server DDR5 RDIMM Product Catalog, checked 2026-10-27