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Four green DDR4 memory sticks, black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 64GB (4x16GB) DDR4 2400 ECC Registered DIMM Z840 C126

SKU CH-WY2H-4YA5C

Four 16 GB DDR4 registered ECC DIMMs at 2400 MHz CL17 and 1.2 V, tested for the HP Z840 workstation

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • 64 GB total capacity from four 16 GB modules
  • ECC registered design protects data integrity in servers
  • DDR4 2400 MHz speed rated at PC4 19200
  • CL17 17-17-17 timings at 1.2 V operation
  • Validated for HP Z840 workstation compatibility

64GB DDR4 ECC Registered Kit

This 64GB kit contains four 16GB DDR4 ECC Registered DIMMs rated at 2400MHz with CL17 timings. It is built specifically for the HP Z840 workstation platform where registered memory is required. The modules operate at 1.2V and use a 288-pin interface with a 2Rx8 rank configuration.

Tool-free DIMM installation

Installation follows the Z840 service guide: populate white DIMM slots first for one DIMM per channel. The processor determines the final clock speed; an 1866MHz capable CPU will limit these modules to 1866MHz. Mixing registered and unbuffered DIMMs is not supported and will prevent boot.

64GB of 512GB maximum capacity

The Z840 supports up to 512GB using registered ECC RDIMMs across 16 total sockets with dual CPUs. This 64GB kit fills four slots and leaves ample headroom for future expansion. Systems requiring more than 512GB or load-reduced DIMMs will need a different memory type.

How it compares

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

Price $356.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.58 per GB
Cheaper than about 69% 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 nameComputer Memory Solutions
Model nameCM2048722400ECCR
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2400 (PC4 19200)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL17
Memory timings17-17-17
ECC supportYes
Buffer typeRegistered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsHp/Compaq Workstation Z840
In the box
Included items4 Memory RAM Sticks

Questions about this item

How can I verify the memory is running at 2400MHz after installing it in my Z840?

Check the system BIOS or UEFI memory information screen; it will report the configured speed. The processor determines the maximum clock — if an 1866MHz-capable CPU is installed the modules will run at 1866MHz instead.

What comes in the box and is anything else required for installation?

The package contains four 16GB DDR4 288-pin ECC Registered DIMM modules. No additional parts are needed; install them into the white DIMM slots first for one DIMM per channel population.

Which kit should I choose if I want to reach the Z840 maximum of 512GB with Registered ECC?

This 64GB (4×16GB) kit is one building block. The Z840 supports up to 512GB using Registered ECC RDIMMs across 16 sockets with two CPUs, so add matching kits until you reach the desired total.

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