We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green rectangular DDR4 DIMM with 288 gold contacts and black memory chips

Cisco Sales

Cisco Sales UCS-MR-X64G4RS-H 64GB DDR4-2666 CL19 ECC Registered server RAM

SKU CH-7Y3M-XDEAP

64 GB DDR4-2666 registered ECC module with CL19 latency, quad-rank 288-pin design for server workloads

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Buffer typeRegistered
  • Memory rank4Rx4
  • Product type288-Pin DDR4 SDRAM
  • 64 GB capacity supports large server workloads
  • DDR4-2666 speed delivers high data throughput
  • CL19 latency ensures responsive memory access
  • ECC registered design protects data integrity
  • 288-pin quad-rank module fits compatible DDR4 slots

Cisco 64 GB DDR4-2666 registered ECC module

This 64 GB DDR4-2666 module uses a 288-pin form factor and operates at PC4-21300 speed with CL19 latency. It is a quad-rank 4Rx4 registered DIMM with ECC for data integrity. The module is designed for servers and workstations that require registered memory.

Compatibility check for registered DDR4 systems

Verify that your motherboard accepts 288-pin registered DDR4 DIMMs and supports quad-rank 4Rx4 modules at 2666 MT/s. Confirm the maximum capacity per slot and the total number of slots available. Ensure the platform can utilise ECC registered memory before ordering.

Suits servers needing high-capacity registered ECC

This module fits administrators expanding memory in compatible Cisco UCS or similar registered-DDR4 platforms. It is not suitable for desktops or laptops that require unbuffered non-ECC SODIMMs or UDIMMs. Buyers who need lower-capacity sticks or unregistered memory should look at other options.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $326.99
Pricier than about 62% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $5.11 per GB
Cheaper than about 72% of the 6,064 comparable items (median $7.25 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 nameCisco
Part numberUCS-MR-X64G4RS-H
Total capacity64 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4

Questions about this item

Does the 64GB DDR4-2666 CL19 ECC Registered module ship as a single 288-pin DIMM or must additional parts be purchased separately?

The product is a single 64GB 288-pin DDR4 SDRAM DIMM; no extra components are required for installation.

When would I choose the 64GB quad-rank CL19 Registered version over a lower-capacity or dual-rank alternative?

Choose this 64GB 4Rx4 module when the server platform supports quad-rank Registered ECC DDR4-2666 and the memory controller can address the full density per slot.

What does the PC4-21300 rating mean for actual throughput once the module is installed in a compatible server?

PC4-21300 indicates a peak transfer rate of 21,300 MB/s at the rated 2666 MT/s data rate when the memory controller runs at the specified CL19 timings.

More in ECC Server RAM

Similar items