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Green rectangular circuit board with gold edge connectors and black memory chips

Micron Technology, Inc.

Micron Technology, Inc. MT18VDDF12872Y-40BD3 1GB DDR-400MT/s 184-RDIMM desktop RAM

SKU CH-E27B-B91JK MPN MT18VDDF12872Y-40BD3

1GB DDR SDRAM desktop memory module running at 400MT/s in a 184-pin RDIMM form factor

  • 1GB capacity supports larger workloads
  • 400MT/s DDR SDRAM delivers responsive data rates
  • 184-pin RDIMM fits registered desktop slots
  • Registered design improves signal integrity for stability
  • Micron-built module ensures consistent manufacturing quality

Capacity and Form Factor

This module provides 1GB of DDR SDRAM in an 184-pin RDIMM package rated for 400MT/s. It is intended for desktop systems that require registered memory with this specific pin count and speed grade.

Upgrade Context

The part replaces an existing 184-pin DDR module when a single 1GB stick is needed to match the motherboard's registered memory requirement. The jump is worth it only if the platform explicitly supports registered DIMMs at this density and speed.

Installation Notes

Installation follows the standard 184-pin DIMM procedure: align the notch, press firmly until the retention clips engage, and verify seating. The most common issue is attempting to use this registered module in a board that accepts only unbuffered memory, which prevents the system from posting.

Highlights

  • 1GB capacity supports larger workloads
  • 400MT/s DDR SDRAM delivers responsive data rates
  • 184-pin RDIMM fits registered desktop slots
  • Registered design improves signal integrity for stability
  • Micron-built module ensures consistent manufacturing quality

Specifications

No published specifications for this item yet.

Questions about this item

Will the 184-pin RDIMM fit my motherboard's DDR DIMM slots?

This module uses the 184-pin RDIMM form factor. It fits desktop motherboards that accept registered DDR SDRAM DIMMs. Check your board manual for registered memory support before purchase.

What is the correct way to seat the 184-pin RDIMM, and what step do builders often miss?

Align the notch on the module with the slot key, press down firmly until both side clips click shut. The step often missed is verifying both clips have fully engaged; a partially seated stick causes boot failure.

Does the 1 GB DDR-400 module need any firmware updates or component replacement over time?

No firmware updates apply to this memory module. It has no moving parts or batteries. Replacement is only needed if the stick fails or if you upgrade to a higher capacity supported by your motherboard.

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