Micron 128GB DDR5-5600 ECC RDIMM 2Rx4 — MTC40F2047S1RC56BB2

The Micron MTC40F2047S1RC56BB2 is a 128GB DDR5-5600 ECC Registered DIMM (RDIMM) in 288-pin form factor operating at 5600MHz (PC5-44800) with CL46 latency at 1.1V. Configured as Dual Rank x4 it delivers high-capacity ECC-protected server memory for 5th Gen Intel Xeon Scalable and AMD EPYC platforms requiring maximum DDR5 capacity per slot.

Key Features

• 128GB capacity — high-density DDR5 ECC RDIMM for maximum memory per slot
• DDR5-5600 (PC5-44800) — high-speed DDR5 server memory
• ECC Registered — error correction and registered buffer for server reliability
• Dual Rank x4 (2Rx4) — high-density x4 die configuration
• CL46 latency at 1.1V
• 288-pin DIMM — standard server memory form factor
• Micron genuine server memory

Product Specifications

• Part Number: MTC40F2047S1RC56BB2
• Manufacturer: Micron
• OEM Status: Genuine Micron
• Capacity: 128GB
• Type: DDR5 ECC RDIMM
• Speed: 5600MHz (PC5-44800)
• CAS Latency: CL46
• Voltage: 1.1V
• Ranks x Width: 2Rx4
• Pins: 288-pin

Memory Specifications

• Capacity: 128GB
• DDR Generation: DDR5
• Speed: 5600MHz
• PC Rating: PC5-44800
• CAS Latency: CL46
• Voltage: 1.1V
• ECC: Yes
• Buffered: Registered (RDIMM)
• Rank Configuration: 2Rx4 (Dual Rank x4)
• Form Factor: 288-pin DIMM

Performance Specifications

• Bandwidth: PC5-44800 (44.8 GB/s theoretical)
• On-Die ECC: Yes (DDR5 standard)
• RAS Features: ECC, registered buffer

Use Cases

• High-memory-density server builds requiring 128GB per DIMM slot
• In-memory database and analytics workloads requiring maximum DRAM capacity
• Virtualization hosts requiring large memory pools per socket
• AI/ML inference servers requiring high-capacity DDR5 memory
• 5th Gen Intel Xeon Scalable and AMD EPYC DDR5 server platforms

Compatibility

• Compatible with DDR5 RDIMM slots on Intel Xeon Scalable (LGA4677) servers
• Compatible with AMD EPYC (SP5) DDR5 server platforms
• Verify server QVL (Qualified Vendor List) before installation
• Not compatible with DDR4 slots or consumer DDR5 platforms

Frequently Asked Questions

What is the difference between MTC40F2047S1RC56BB2 and MTC40F2047S1RC56BB2R?

The R suffix in MTC40F2047S1RC56BB2R indicates a Renesas register component variant. Both modules have identical electrical specifications and performance — the difference is the register chip vendor used in manufacturing.

What does 2Rx4 mean?

2Rx4 means Dual Rank x4 — the DIMM has two ranks of memory chips with x4 (4-bit wide) DRAM devices. x4 die allows higher capacity per DIMM compared to x8 configurations.

Why choose 128GB RDIMM over multiple smaller DIMMs?

Using fewer high-capacity DIMMs reduces memory channel loading and simplifies memory configuration while maximizing total memory capacity per server socket.

The Micron MTC40F2047S1RC56BB2 delivers 128GB of DDR5-5600 ECC registered server memory in 2Rx4 configuration — purpose-built for Intel Xeon Scalable and AMD EPYC DDR5 server platforms requiring maximum per-slot memory capacity.