IBM 16GB 2400MHz DDR4 PC4-19200 ECC Registered CL17 288-Pin DIMM 1.2V Dual Rank x4 Memory Module – 46W0831

IBM 16GB DDR4-2400 ECC Registered RDIMM for IBM/Lenovo Servers

The IBM 46W0831 is a 16GB DDR4-2400 (PC4-19200) ECC Registered DIMM featuring CL17 latency, 1.2V operation, and dual rank x4 organization — IBM-qualified server memory designed for IBM System x and Lenovo ThinkSystem servers requiring reliable, error-correcting DRAM for enterprise workloads.

Key Features

• 16GB DDR4-2400 ECC Registered for IBM System x and Lenovo ThinkSystem server platforms
• Error Correcting Code (ECC) for hardware-level memory error detection and correction
• Registered (buffered) DIMM for multi-DIMM channel stability in high-density configurations
• 1.2V low-voltage operation for energy-efficient server memory
• IBM-qualified and validated for supported IBM/Lenovo server platforms

Product Specifications

• Part Number: 46W0831
• Manufacturer: IBM / Lenovo
• Capacity: 16GB
• Type: DDR4 ECC RDIMM
• Speed: 2400MHz (PC4-19200)
• CAS Latency: CL17
• Voltage: 1.2V
• Pins: 288-pin

Memory Specifications

• Ranks x Width: 2Rx4 (Dual Rank x4)
• ECC: Yes (Single-bit error correction, multi-bit error detection)
• Registered: Yes (RDIMM — buffered)
• On-Die ECC: No (system-level ECC only)
• Operating Temperature: 0°C to 85°C

Performance Specifications

• Peak Bandwidth: ~38.4 GB/s (dual-channel at 2400MHz)
• Module Height: Low-profile (standard 1.2V server DIMM)
• Timing: 17-17-17
• JEDEC Compliant: Yes (DDR4-2400 JEDEC standard)

Use Cases

• Memory expansion for IBM System x3550 M5, x3650 M5, and compatible platforms
• Lenovo ThinkSystem SR530, SR630, SR650 server memory upgrades
• ECC RDIMM population for virtualization hosts requiring reliable, large-capacity RAM
• Database server memory expansion requiring IBM-validated DDR4-2400 RDIMMs

Compatibility

• Compatible with IBM System x servers supporting DDR4-2400 ECC Registered DIMMs
• Compatible with Lenovo ThinkSystem SR series servers (verify DIMM population rules)
• Verify maximum DIMM count and channel configuration with IBM/Lenovo memory configurator
• Not compatible with consumer desktops or non-ECC server platforms

Frequently Asked Questions

What does Dual Rank x4 (2Rx4) mean?

2Rx4 indicates the DIMM has two ranks of DRAM chips, each 4 bits wide. Dual-rank DIMMs can provide higher memory bandwidth than single-rank modules by allowing the memory controller to interleave between ranks, improving overall throughput.

Is the 46W0831 compatible with Lenovo servers despite the IBM part number?

Yes — IBM part number 46W0831 is also used in Lenovo”s ThinkSystem portfolio following the IBM System x acquisition by Lenovo. This RDIMM is qualified for both IBM System x and compatible Lenovo ThinkSystem servers.

Can I mix 46W0831 with other DDR4-2400 RDIMMs in the same server?

IBM and Lenovo recommend populating channels with identical DIMMs for optimal performance and stability. Mixing DIMM capacities or rank configurations may be supported but could reduce operating speed — always consult the server”s memory population guide.

The IBM 46W0831 delivers 16GB of DDR4-2400 ECC Registered memory with the IBM platform validation and dual-rank performance characteristics that enterprise server environments require — providing reliable, error-correcting DRAM expansion for IBM System x and Lenovo ThinkSystem workloads demanding memory capacity and RAS integrity.