SK hynix HMAA8GR7AJR4N-XN
Expert rating8.1 / 10
- Capacity:
- 64GB
- Speed:
- 3200MT/s
- ECC:
- Yes
- Form Factor:
- RDIMM
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Manufacturer: SK hynix Last updated: 2026-09-12
Where to buy
- memory.netGo to store
- ServerSupplyGo to store
SK hynix HMAA8GR7AJR4N-XN Review
SK hynix HMAA8GR7AJR4N-XN turns up constantly on server memory cross-reference lists, and if that's what brought you here, it's a genuine 64GB DDR4-3200 ECC Registered DIMM built for 2nd-gen Xeon Scalable and EPYC 7002-series servers needing high per-DIMM capacity.
At 64GB per module, this is one of the higher-density DDR4 RDIMMs still commonly stocked, useful for maxing out a server's memory capacity without needing every DIMM slot populated, which also leaves headroom for future capacity expansion.
Why 64GB Density Matters
A server with 16 DIMM slots hits 1TB of RAM using 64GB modules versus 512GB using 32GB modules at the same slot count; for memory-hungry virtualization hosts or in-memory database servers, higher per-DIMM density often matters more than raw clock speed.
Comparison to Alternatives
This is SK hynix's higher-capacity sibling to their own HMA84GR7CJR4N-XN (32GB DDR4-3200 ECC RDIMM) already in this catalog, same speed and rank configuration, just double the density per module. Against Samsung's M393A2K43DB3-CWE (16GB DDR4-3200 ECC RDIMM), this SK hynix module is four times the capacity per slot for workloads that need to maximize total server RAM.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating8.1 / 10
High-density DDR4 server memory that lets you hit large total capacities without populating every DIMM slot, a smart pick for virtualization-heavy deployments.
Best for
- Virtualization hosts and hypervisors needing maximum RAM density
- 2nd-gen Xeon Scalable and EPYC 7002-series server upgrades
- In-memory database servers (Redis, SAP HANA-adjacent workloads)
Not for
- Consumer desktop motherboards
- Budget server builds where 16-32GB modules are sufficient
- Systems requiring UDIMM rather than RDIMM
Specifications
What these specs meanIdentity
| Peak Bandwidth | 25.6 GB/s |
|---|---|
| Brand | SK hynix |
| Part Number | HMAA8GR7AJR4N-XN |
| Series | SK hynix Server Memory |
Memory
| DDR Generation | DDR4 |
|---|---|
| Capacity | 64 GB |
| Speed | 3200MT/s (PC4-25600) |
| CAS Latency | 22 |
| Module Count | 1 |
| Voltage | 1.2 V |
Physical
| Form Factor | Desktop DIMM |
|---|---|
| RGB Lighting | No |
Module and platform
| RAM Segment | Server |
|---|
Capacity
| Capacity Per Module | 64 GB |
|---|
Speed and timings
| True Latency | 13.8 ns |
|---|
Silicon
| ECC | Yes |
|---|
Physical and lighting
| Colour | Green |
|---|
Commercial
| Warranty | Limited Lifetime |
|---|
FAQs
What are the key specifications of the SK hynix HMAA8GR7AJR4N-XN (64GB DDR4-3200 ECC RDIMM/CL22/2Rx4/1.2V/288-Pin/Registered)?
The SK hynix HMAA8GR7AJR4N-XN (64GB DDR4-3200 ECC RDIMM/CL22/2Rx4/1.2V/288-Pin/Registered) is a memory kit from SK hynix. Key specs: DDR Generation DDR4, Capacity 64GB, Module Count 1, Speed 3200MT/s (PC4-25600), CAS Latency 22.
Will the SK hynix HMAA8GR7AJR4N-XN (64GB DDR4-3200 ECC RDIMM/CL22/2Rx4/1.2V/288-Pin/Registered) work with my current setup?
The SK hynix HMAA8GR7AJR4N-XN (64GB DDR4-3200 ECC RDIMM/CL22/2Rx4/1.2V/288-Pin/Registered) lists DDR Generation is DDR4. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits. Our upgrade checker at /upgrade can confirm compatibility for common combinations.
Who is the SK hynix HMAA8GR7AJR4N-XN (64GB DDR4-3200 ECC RDIMM/CL22/2Rx4/1.2V/288-Pin/Registered) best suited to?
Best suited to: Virtualization hosts and hypervisors needing maximum RAM density; 2nd-gen Xeon Scalable and EPYC 7002-series server upgrades; In-memory database servers (Redis, SAP HANA-adjacent workloads).
What are the drawbacks of the SK hynix HMAA8GR7AJR4N-XN (64GB DDR4-3200 ECC RDIMM/CL22/2Rx4/1.2V/288-Pin/Registered)?
Not the best fit for: Consumer desktop motherboards; Budget server builds where 16-32GB modules are sufficient; Systems requiring UDIMM rather than RDIMM.