HMCG94AGBRA181N: SK hynix 64GB DDR5-5600MHz PC5-44800 ECC Registered CL46 2Rx4 RDIMM Server Memory
Also listed as: HMCG94AGBRA181N-AA, SK hynix 64GB DDR5-5600 RDIMM, HMCG94AGBRA · made by SK hynix
The SK hynix HMCG94AGBRA181N is a high-speed 64GB dual-rank (2Rx4) DDR5-5600 registered ECC DIMM designed to maximize memory bandwidth in 5th Gen Intel Xeon Scalable (Emerald Rapids) and AMD EPYC 9004/9005 servers. Operating at 5600 MT/s with CL46 timing at 1.1V, it provides substantial bandwidth increases over first-generation DDR5-4800 modules. When buying used 5600MHz RDIMMs, ensure your server CPU stepping supports full 5600 MT/s speeds, verify gold contacts are unblemished, and check SPD revision compatibility.
Specifications
| Part number | HMCG94AGBRA181N |
|---|---|
| Brand | SK hynix |
| Made by | SK hynix |
| Type | Memory |
| Other numbers | HMCG94AGBRA181N-AA, SK hynix 64GB DDR5-5600 RDIMM, HMCG94AGBRA |
| Status | current |
| Capacity (GB) | 64 |
| Speed | DDR5-5600 |
| Rank width | 2Rx4 |
| Generation fit | Intel 5th Gen Xeon Scalable and AMD EPYC 9004 series servers |
About the HMCG94AGBRA181N
HMCG94AGBRA181N is SK hynix's high-speed 64GB dual-rank (2Rx4) DDR5-5600 registered ECC memory module engineered for 5th Gen Intel Xeon Scalable (Emerald Rapids) and AMD EPYC 9004/9005 servers. Operating at 5600 MT/s at 1.1V with CL46 latency, it delivers 44.8 GB/s peak channel bandwidth, providing a substantial speed boost for memory-bound artificial intelligence, simulation, and in-memory caching workloads.
Compatibility
Compatible with enterprise servers supporting DDR5-5600 RDIMMs, including Dell PowerEdge 16G, HPE ProLiant Gen11, and Lenovo ThinkSystem V3. Compatible CPU models supporting 5600 MT/s are required to reach full speed; otherwise, modules automatically downclock to 4800 MT/s. It does not fit DDR4 slots.
How to identify a genuine unit
The module features an SK hynix label displaying part number HMCG94AGBRA181N and specifications 64GB 2Rx4 PC5-5600B-RC0. The PCB layout features high-frequency trace tuning and an updated PMIC. In system hardware inventories, it identifies as SK hynix DDR5-5600.
Buying used
Verify that all 288 gold pins are unblemished and free of scratches or solder residue. Confirm that your server's processor tier and BIOS support 5600 MT/s memory operation. Request memory diagnostic logs confirming error-free operation at full rated bus speed.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 280 (1 sighting, Oct 2026)
Used: USD 185 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 280 | 2026-10-27 | |
| ebay.com | used | USD 185 | 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 4X77A81435 Lenovo ThinkSystem 32GB TruDDR5 5600MHz (1Rx4) RDIMM ThinkSystem 64GB TruDDR5 5600MHz 2Rx4 RDIMM
- Dell AB949337 Dell 64GB DDR5 5600MHz 2Rx4 RDIMM
FAQ
What speed does this module operate at?
DDR5-5600 (PC5-44800) with 44.8 GB/s per channel peak bandwidth.
Can it downclock to 4800 MT/s?
Yes, DDR5 modules automatically downclock to match CPU maximum memory frequency.
Buying or selling HMCG94AGBRA181N?
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