Model:
SK hynix HMA82GR7AFR4N-UH 16GB DDR4 ECC RDIMM

Key specifications


Capacity: 16GB
Memory type: DDR4 SDRAM
Form factor: 288-pin RDIMM
Speed: DDR4-2400 / PC4-19200
ECC: Yes (Error Correcting Code)
Registered/Buffered: Yes (RDIMM)
Rank: 1Rx4
CAS latency: CL17
Voltage: 1.2V

Compatibility notes
This module is intended for:


Intel Xeon servers
AMD EPYC server platforms
Enterprise systems from vendors like Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, Supermicro, etc.

It will not work in standard consumer desktops or most gaming motherboards because it is:


ECC
Registered (buffered) memory

Many Reddit homelab users report using this exact module in systems like Dell R730xd and HPE enterprise servers.
Important compatibility checks
Before buying, verify:


Your motherboard supports DDR4 RDIMM
Your CPU supports ECC Registered memory
Your server supports 1Rx4 DIMMs
Mixing RDIMM with UDIMM is usually unsupportedSome systems are picky about exact ranks or vendor QVL listings. One recent report showed incompatibility with a specific ASRock server board despite similar Hynix modules being listed.

Typical use cases


Virtualization servers
NAS / homelab builds
Dell PowerEdge Gen13/14
HPE Gen9/Gen10
VMware / Proxmox / TrueNAS systems