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Two green DDR4 DIMMs with black chips, no heat spreaders

Computer Memory Solutions

Computer Memory Solutions CM4096722400ECCR 64GB (2x32GB) DDR4 2400 ECC Registered DIMM memory upgrade

SKU CH-ACDX-SMT7J

64 GB kit of two 32 GB DDR4 2400 ECC registered DIMMs for HP Z840 workstations

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • ECC Registered protects data integrity for server workloads
  • 64GB kit (2x32GB) expands Z840 capacity to 512GB max
  • DDR4 2400 (PC4-19200) runs at optimal speed per processor
  • CL17 1.2V timing balances low latency with efficient power
  • 288-pin DIMM fits HP/Compaq Workstation Z840 white slots only

64 GB DDR4 ECC Registered kit for HP Z840

This 64 GB kit contains two 32 GB DDR4 2400 MHz registered DIMMs with ECC and a CL17 timing. It is built for the HP Compaq Workstation Z840 and runs at 1.2 V on major-brand chipsets. The modules are unbuffered by a heat spreader and use a 2Rx4 organisation.

Upgrade from non-ECC or lower-capacity DDR4

The Z840 supports up to 512 GB of registered ECC RDIMMs across 16 slots when two CPUs are installed. Adding this kit increases capacity while keeping the registered ECC topology the platform requires. If the installed processor only supports 1866 MHz the memory will clock down automatically to match the CPU capability.

Tool-free DIMM installation with channel rules

Installation is a simple press into the 288-pin slots, but the Z840 uses white DIMM slots to mark the first slot of each channel. For one DIMM per channel populate only the white slots. Mixing registered and unbuffered modules or filling slots in the wrong order will prevent the system from posting.

How it compares

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

Price $445.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (2 × 32 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $6.97 per GB
Cheaper than about 57% 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 nameCM4096722400ECCR
Total capacity64 GB (2 × 32 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 rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsHp/Compaq Workstation Z840
In the box
Included items2 Memory RAM Sticks

Questions about this item

Does the 288-pin DDR4 DIMM fit the white DIMM slots on the HP Z840 workstation?

Yes, the 288-pin DDR4 DIMMs are designed for the Z840's registered DIMM slots; the white slots mark the first DIMM per channel for single-DIMM-per-channel population.

What is the correct way to install the two 32 GB modules so the Z840 runs them at 2400 MHz?

Install one module per channel in the white slots first; if an 1866 MHz processor is fitted the memory will clock down to 1866 MHz regardless of the 2400 MHz rating.

When would the registered ECC modules need to be replaced in a Z840 running at the 512 GB maximum?

Replace modules only if memory diagnostics report correctable ECC errors rising above threshold or if a future CPU upgrade requires a different speed grade.

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