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 printed circuit board DDR4 memory module with black chips and gold edge connectors

A-Tech

A-Tech 4GB DDR4 2133 ECC UDIMM 1Rx8 Server Memory

SKU CH-4YJN-7702Y

4GB DDR4 2133 ECC UDIMM server memory with CL15 latency and 1.2V operation

  • Total capacity4 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • ECC protection guards data integrity with built-in error correction
  • DDR4 2133 MHz speed accelerates server responsiveness and multitasking
  • Low 1.20V voltage reduces power draw and heat output
  • Single-rank 1Rx8 layout ensures broad platform compatibility
  • 288-pin UDIMM form factor fits standard server memory slots

4GB DDR4 2133 ECC UDIMM for Servers

This 4 GB DDR4 2133 module adds error-correcting memory to compatible servers and workstations. It runs at 1.20 V with a CL15 latency and uses a 1Rx8 unbuffered layout. The 288-pin DIMM fits standard DDR4 slots in systems that support ECC unbuffered memory.

DDR4 2133 speed and ECC limits

DDR4 2133 sets the maximum data rate at 2133 MT/s, so the module cannot run faster even if the platform supports higher speeds. ECC unbuffered memory requires a chipset and CPU that both enable error correction without registered buffering; consumer platforms typically disable this feature. The single-rank 1Rx8 organisation caps density per module at 4 GB.

Replaces Kingston KVR21E15S8/4

This A-Tech module is a direct replacement for the Kingston KVR21E15S8/4 part number. The upgrade is worthwhile when a system has empty DDR4 ECC UDIMM slots and the workload benefits from extra capacity or from replacing a failed stick. It is not suited for platforms that require registered or load-reduced DIMMs, nor for boards that only accept non-ECC memory.

How it compares

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

Price $29.99
Cheaper than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 4 GB
Lower than about 95% of the 6,064 comparable items (median 32 GB).
Price per GB $7.50 per GB
Typical for this category: the median of 6,064 items is $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 nameA-Tech
Product lineCompatible Replacement for Kingston
Model nameKVR21E15S8/4
Total capacity4 GB
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL15
ECC supportYes
Buffer typeUnbuffered
Memory rank1Rx8
Power
Rated voltage1.2 V

Questions about this item

Should I pick the 4GB 2133MHz CL15 module or a higher-capacity stick?

Choose the 4GB module when your server has limited DIMM slots and you only need a small capacity increase; add another identical 4GB stick later if the board supports dual-channel.

What does the 2133MHz rating deliver in a live server?

The module runs at 2133MHz with CL15 timing, giving a peak bandwidth of 17000 MB/s; actual throughput depends on your CPU memory controller and the number of populated channels.

Is the DDR4 288-pin ECC UDIMM interface compatible with registered DIMM slots?

No — this is an unbuffered ECC UDIMM (288-pin) and will not work in slots that require registered or load-reduced DIMMs; verify your motherboard accepts unbuffered ECC before buying.

More in ECC Server RAM

Similar items