SK Hynix 32GB DDR4-2666MHz PC4-21300 ECC Unbuffered CL19 288-Pin DIMM 1.2V Dual Rank x8 Memory Module — HMAA4GU7AJR8N-VK

The SK Hynix HMAA4GU7AJR8N-VK is a 32GB DDR4-2666MHz ECC Unbuffered DIMM (UDIMM) memory module operating at 1.2V with CL19 latency. Featuring a 288-pin interface and Dual Rank x8 (2Rx8) configuration with AJR NAND die, it delivers ECC error correction in an unbuffered form factor for workstation and server platforms supporting ECC UDIMM memory at DDR4-2666 speeds.

Key Features

• 32GB DDR4-2666MHz ECC Unbuffered DIMM for workstation and server platforms
• DDR4-2666MHz (PC4-21300) for high-bandwidth memory performance
• ECC Unbuffered DIMM (UDIMM) — ECC without register buffer
• Dual Rank x8 (2Rx8) configuration
• AJR NAND die — SK Hynix AJR generation memory die
• 1.2V low-voltage operation for energy-efficient operation

Product Specifications

• Part Number: HMAA4GU7AJR8N-VK
• Manufacturer: SK Hynix
• OEM Status: Genuine SK Hynix OEM
• Capacity: 32GB
• Type: DDR4 ECC Unbuffered DIMM (UDIMM)
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Voltage: 1.2V
• Rank / Organization: Dual Rank x8 (2Rx8)
• Pins: 288-Pin
• ECC: Yes

Memory Specifications

• Capacity: 32GB
• DIMM Type: ECC Unbuffered (UDIMM)
• DDR Generation: DDR4
• Pin Count: 288-Pin
• Rank: Dual Rank (2Rx8)
• Voltage: 1.2V
• ECC: Yes (Error-Correcting Code)
• Die Type: AJR

Performance Specifications

• Speed: DDR4-2666MHz
• Bandwidth: PC4-21300
• CAS Latency: CL19
• XMP / JEDEC: JEDEC standard

Use Cases

• Workstation memory for AMD Ryzen Pro and Intel Xeon W platforms supporting ECC UDIMM
• Entry-level server platforms supporting DDR4-2666 ECC Unbuffered DIMM
• Professional workstation applications requiring ECC at DDR4-2666 speeds
• AMD EPYC platforms supporting ECC UDIMM configurations

Compatibility

• Compatible with platforms supporting DDR4-2666 ECC Unbuffered (UDIMM) memory
• Compatible with AMD Ryzen Pro, Intel Xeon W, and AMD EPYC platforms supporting ECC UDIMM
• Not compatible with RDIMM or LRDIMM systems — verify ECC UDIMM support before ordering
• Verify platform QVL (Qualified Vendor List) before ordering

Frequently Asked Questions

What is the difference between HMAA4GU7AJR8N-VK (DDR4-2666) and HMAA4GU7AJR8N-XN (DDR4-3200)?

Both are SK Hynix 32GB DDR4 ECC UDIMM 2Rx8 AJR die modules. VK runs at DDR4-2666MHz (PC4-21300) while XN runs at DDR4-3200MHz (PC4-25600) — different speed grades.

Does ECC UDIMM require special motherboard support?

Yes, ECC UDIMM requires explicit motherboard/platform support for ECC. Not all consumer platforms support ECC — verify your platform's ECC UDIMM compatibility before ordering.

Is HMAA4GU7AJR8N-VK compatible with AMD Ryzen Pro platforms?

Yes, AMD Ryzen Pro platforms with ECC UDIMM support are compatible. Verify your specific motherboard's ECC UDIMM support before ordering.

The SK Hynix HMAA4GU7AJR8N-VK 32GB DDR4-2666 ECC Unbuffered DIMM delivers reliable ECC memory for workstation and entry-level server platforms. Order today for genuine SK Hynix ECC UDIMM quality.