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Green rectangular DDR4 RDIMM module with black chips and gold contacts, no heat spreader

OWC

OWC 2R9D48R4128G 128GB DDR4 2933 CL21 8Rx4 ECC RDIMM memory upgrade

SKU CH-DY91-GMH27

128GB DDR4 2933 ECC registered RDIMM for ASUS RS500 and RS700 rack servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB single-module capacity simplifies server upgrades
  • DDR4 2933 CL21 speed matches ASUS rack server specs
  • ECC registered design protects data integrity in critical workloads
  • 2V operation reduces power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666MHz systems

Server ECC upgrade

This 128GB DDR4 2933 CL21 8Rx4 ECC Registered RDIMM is built for ASUS Rack Server RS500-E9 and RS700-E9 series systems. It targets administrators who need maximum capacity in a single 288-pin module to extend the life of existing infrastructure.

Registered DDR4 constraints

The module runs at 1.2V with JEDEC PC4-23400 timing and will down-clock to 2133, 2400 or 2666 MHz when the platform requires it. It cannot be mixed with unbuffered or load-reduced DIMMs and will not function in standard desktop or consumer workstation boards.

Single-module density

A single 128GB stick leaves remaining slots free for future expansion while delivering 8Rx4 organisation for high-density server workloads. The bare 288-pin PCB has no heat spreader, so airflow across the DIMM row must be maintained by the chassis design.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $657.99
Pricier than about 55% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
CAS latency 21
Lower than about 63% of the 483 comparable items (median 22).
Price per GB $5.14 per GB
Cheaper than about 75% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2R9D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latency21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASUS Rack Server RS500-E9-PS4
ASUS Rack Server RS500-E9-RS4-U
ASUS Rack Server RS700-E9-RS12
ASUS Rack Server RS700-E9-RS4
ASUS Rack Server RS720-E9-RS12-E

Questions about this item

Should I pick this single 128GB 8Rx4 module or combine smaller DIMMs to reach the same capacity?

This is one 128GB DDR4 2933 CL21 8Rx4 ECC Registered RDIMM; using a single module fills one slot and leaves remaining slots free for future expansion.

What does the 2933 MT/s rating deliver in an ASUS RS500-E9 or RS700-E9 server?

The module runs at DDR4 2933 (PC4-23400) with CAS 21 at 1.2V; the server’s memory controller will operate it at that speed or at a supported lower speed such as 2666, 2400 or 2133 MT/s.

How does the DDR4 288-pin ECC Registered interface limit usable bandwidth?

The 288-pin DDR4 ECC Registered interface connects at up to 2933 MT/s; registered buffering adds one cycle of latency but allows the platform to populate all slots without signal-integrity limits.

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