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Green rectangular DDR4 module with gold edge connectors and black memory chips on both sides

SAMSUNG

SAMSUNG 8GB DDR4 2133 ECC RDIMM 1Rx4 M393A1G40DB0-CPB2Q

SKU CH-JY78-5YTX9

An 8 GB registered DDR4 ECC module running at 2133 MT/s with CL15 latency and 1.2 V operation

  • Total capacity8 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • ECC protection prevents data corruption with 8-bit parity check
  • Registered design stabilises signals through on-board registers
  • 2133 MT/s speed delivers 17000 MB/s bandwidth
  • Single-rank 1Rx4 layout keeps electrical load low
  • 20 V operation reduces power draw per module

8GB DDR4 ECC Registered DIMM

This 8GB DDR4 module is built for servers and workstations that require error-correcting registered memory. It operates at 2133 MT/s with a CAS latency of 15 at 1.20V. The single-rank x4 organisation uses a 288-pin form factor. Buyers needing non-ECC or unbuffered DIMMs for consumer platforms cannot use this module.

Registered ECC with 1Rx4 organisation

The registered buffer and on-die ECC are the decisive specifications for compatibility. The module presents a 1Rx4 configuration with an 8-bit parity signal for error correction. Registers retime clock, command and control signals to reduce electrical load on the memory controller. Systems that require unbuffered memory or a different rank structure will not accept this DIMM.

Steady throughput at 1.20V

Under sustained load the module maintains its rated 2133 MT/s speed and CL15 timing at the standard 1.20V. The registered design helps signal integrity across fully populated channels during long compute runs. Thermal behaviour follows the DDR4 specification for registered DIMMs. No higher speeds or lower latencies are supported beyond the rated figures.

How it compares

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

Price $47.99
Cheaper than about 78% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $6.00 per GB
Cheaper than about 65% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameSAMSUNG
Product lineServer Memory
Model nameSAMSUNG:M393A1G40DB0-CPB
SAMSUNG:M393A1G40EB1-CPB
CRUCIAL:CT8G4RFS4213
HYNIX:HMA41GR7MFR4N-TF
KINGSTON:KVR21R15S4/8
Total capacity8 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL15
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsM393A1G40DB0-CPB

Questions about this item

How does the DDR4 2133 speed translate to real-world bandwidth inside a server?

The PC4-17000 rating means a peak transfer rate of 17 GB/s per module, so an 8 GB stick delivers that bandwidth when the memory controller runs at the rated 2133 MT/s.

What does the registered ECC design mean for signal integrity and capacity limits?

The onboard register re-drives clock, command and control lines, reducing electrical load on the CPU memory controller and allowing larger total memory populations than unbuffered DIMMs.

Will the 30 mm module height clear standard 1U server heatsinks and DIMM slots?

At 30 mm tall, 133 mm long and 3 mm thick, the 288-pin RDIMM fits the standard DDR4 slot profile used in the validated Supermicro X10 boards listed.

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