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Four green DDR4 DIMMs with black chips, no heat spreaders

Computer Memory Solutions

Computer Memory Solutions CM2048722400ECCR 64GB (4x16GB) DDR4 2400 ECC Registered DIMM

SKU CH-A5FF-0VW18

64 GB ECC registered DDR4 kit with four 16 GB modules at 2400 MHz CL17 for HP Z640 workstations

  • 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 for heavy workloads
  • ECC registered design protects data integrity
  • 2400 MHz DDR4 speed matches system specs
  • 4 x 16 GB kit fills four slots
  • 2 V operation reduces power draw

HP Z640 ECC registered kit

This 64GB kit contains four 16GB DDR4 modules built for the HP Z640 workstation. Each stick is a registered ECC DIMM that plugs into a 288-pin slot and runs at 1.2V. The kit is intended for servers and workstations that require error-correcting memory.

Sustained load behaviour

Registered buffering reduces electrical load on the memory controller when all four DIMMs are populated. The modules operate at CL17 timings and will clock down automatically if the installed processor only supports 1866MHz speeds. This keeps the subsystem stable during long compute sessions.

Deciding specification

The registered ECC design means this kit only works in platforms that accept registered DIMMs; it will not function in desktop boards that require unbuffered memory. Buyers who need standard desktop DDR4 should choose a different module type.

How it compares

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

Price $326.99
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 $5.11 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 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 Z640
In the box
Included items4 Memory RAM Sticks

Questions about this item

How much power does each 16GB DDR4 2400 ECC registered DIMM draw at its rated 1.2V voltage?

Each module operates at 1.2V, the standard DDR4 voltage, so power draw stays low even when all four sticks run continuously in a Z640 workstation.

Does the HP Z640 workstation need a specific BIOS version or processor to recognise this 4x16GB registered ECC kit?

The Z640 supports up to 256GB of registered ECC RDIMMs; the installed processor determines whether the memory runs at 2400MHz or clocks down to 1866MHz.

Can I mix these 2Rx8 CL17 registered DIMMs with older unbuffered ECC modules already in my Z640?

No, registered and unbuffered ECC DIMMs cannot be mixed; the Z640 requires registered modules only, so all slots must use registered kits like this one.

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