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Four green DDR4 modules with silver heatspreaders and gold contacts

Kingston Technology Corp.

Kingston Technology Corp. KVR21R15D4K4/64 64GB (4 x 16GB) DDR4 2133 CL15 ECC Registered Server RAM

SKU CH-NWWZ-9V0CJ MPN KVR21R15D4K4/64

A quad-channel kit of four 16 GB DDR4 registered ECC modules running at 2133 MT/s with CL15 latency for server workloads

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Buffer typeRegistered
  • Kit configurationQuad Channel Kit
  • Product type288-Pin DDR4 SDRAM
  • ECC protection prevents data corruption in critical workloads
  • Registered buffering reduces electrical load for stable server operation
  • Quad-channel kit delivers 64 GB total capacity across four matched modules
  • DDR4 2133 speed with CL15 latency balances throughput and responsiveness
  • 288-pin DDR4 form factor fits standard server memory slots

64GB Quad-Channel DDR4 Kit

This Kingston KVR21R15D4K4/64 kit provides 64GB of server memory across four 16GB modules. It uses 288-Pin DDR4 SDRAM rated for 2133 MT/s with a CL15 latency. The modules feature ECC Registered operation and DR x4 organisation with thermal sensing. The kit is new and was first listed by the manufacturer in 2018.

For ECC Registered Platforms Only

This memory suits servers and workstations that require Registered DIMMs with error correction. It will not function in consumer desktop boards or laptops that accept only unbuffered non-ECC memory. Buyers needing unbuffered DDR4 or higher speeds than 2133 MT/s should select a different kit.

Registered ECC Decides Compatibility

The single specification that determines fit is the Registered ECC design. Only systems with chipsets and CPUs that explicitly support Registered DDR4 ECC modules can use this kit. Verify the platform documentation before purchase.

How it compares

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

Price $603.99
Pricier than about 73% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $9.44 per GB
Pricier than about 65% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameKingston
Model nameKVR21R15D4K4/64
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Size & build
Shipping weight0.12 kg
Package size165 × 104 × 39 mm

Questions about this item

How do I install the 288-pin DDR4 modules and what step is often missed?

Align the notch on each 16 GB stick with the motherboard slot key, press down firmly until both retention clips click, then repeat for all four modules to complete the quad-channel kit.

What maintenance or replacement will the ECC registered memory need over time?

The modules have no moving parts and require no scheduled maintenance; replacement is only necessary if a stick fails or if the server is upgraded to a different memory generation.

What limit appears first when the quad-channel kit runs at DDR4 2133 under sustained load?

The CL15 latency at 2133 MT/s sets the bandwidth ceiling, so throughput plateaus before thermal throttling becomes a factor.

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