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Four black DDR5 RDIMM modules with silver heat spreaders

Kingston Technology Corp.

Kingston Technology Corp. KF556R36RBK4-128 128GB (4x32GB) DDR5-5600 CL36 ECC RDIMM server RAM

SKU CH-EJ33-F0ES9 MPN KF556R36RBK4-128

128 GB quad-channel DDR5 RDIMM kit with ECC, CL36 latency and 5600 MHz speed for workstation reliability

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • CAS latencyCL36
  • Memory timings36-38-38
  • Rated voltage1.25 V
  • Buffer typeRegistered
  • 128 GB total capacity from four 32 GB modules for large workloads
  • DDR5-5600 speed with CL36 latency for responsive data access
  • Registered ECC design detects and corrects errors to protect data integrity
  • Intel XMP 3.0 profiles enable automatic overclocking to rated performance
  • 25 V operation with integrated heat spreader for stable thermals

Capacity and Configuration

This kit provides 128GB of DDR5 memory across four 32GB registered DIMMs. It targets workstation and high-end desktop users who need ECC data integrity with overclockable performance for demanding creative or engineering workloads.

Installation and Common Issues

The 288-pin RDIMM modules install in standard DDR5 slots but require a platform that supports registered memory and Intel XMP 3.0 profiles. Builders often mistakenly pair RDIMMs with consumer motherboards that only accept unbuffered DIMMs, preventing the system from posting.

Suitable Buyers and Limitations

This memory suits professionals building Intel or AMD workstations that explicitly support DDR5 RDIMMs and need 128GB capacity with hardware ECC. It is not for buyers whose motherboards only accept unbuffered UDIMMs or who need capacities beyond the four-module kit limit.

How it compares

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

Price $4,187.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $32.72 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameKingston
Product lineFury Renegade Pro
Model nameKF556R36RBK4-128
Total capacity128 GB (4 × 32 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Memory
CAS latencyCL36
Memory timings36-38-38
ECC supportYes
Buffer typeRegistered
Kit configurationQuad Channel Kit
Memory profilesIntel XMP 3.0
Heat spreaderYes
Power
Rated voltage1.25 V
Size & build
Shipping weight0.09 kg
Package size160 × 100 × 33 mm

Questions about this item

How can I confirm the kit is running at DDR5-5600 CL36 with ECC active after installation?

Enable the Intel XMP 3.0 profile in the BIOS, then verify the memory speed shows 5600 MHz and timings read 36-38-38; ECC status will appear as Registered ECC in system information tools.

What exactly ships in the box and is anything else required to use the four modules?

The box contains four 32 GB DDR5-5600 CL36 RDIMMs with heat spreaders, totalling 128 GB; no additional components are needed if the motherboard has four 288-pin DDR5 RDIMM slots.

Should I choose this 128 GB quad-channel kit or a different capacity for my workstation build?

Select this 128 GB (4 × 32 GB) kit when you need maximum registered ECC capacity across four channels at 5600 MHz; smaller kits reduce total memory and channel count.

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