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Green circuit board with black memory chips and gold contacts

Lenovo

Lenovo 4X77B09751 32GB 2RX8 PC5-6400 16Gb 10x4-1S desktop RAM

SKU CH-EM89-FEYYH

32 GB dual-rank desktop memory module rated at PC5-6400 with 16 Gb density and 10x4-1S organisation

  • Total capacity32 GB
  • 32 GB capacity supports demanding workloads
  • Dual-rank 2RX8 organisation improves memory throughput
  • PC5-6400 rating delivers 6400 MT/s data rate
  • 16 Gb density chips enable high capacity per module
  • Qualified for Lenovo SR635 V3 and SR655 V3 systems

Lenovo 32GB PC5-6400 Desktop Memory

Lenovo 4X77B09751 is a 32GB desktop memory module rated at PC5-6400. It uses a 2RX8 organisation with 16Gb components in a 10x4-1S layout. The part is validated for Lenovo SR635 V3 and SR655 V3 systems.

Who This Suits And Who Should Look Elsewhere

This module suits administrators upgrading or repairing compatible Lenovo ThinkSystem servers. Buyers who need a different capacity, rank configuration or form factor should look elsewhere. It is not intended for consumer desktop boards or laptops.

PC5-6400 Speed Rating

The PC5-6400 rating defines the module's data transfer rate and timing envelope. Matching this rating to the platform's qualified vendor list is the single specification that decides whether this is the right part.

How it compares

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

Price $4,359.99
Pricier than about 91% of the 3,647 comparable items (median $90.99).
Total capacity 32 GB
Higher than about 70% of the 3,251 comparable items (median 16 GB).
Price per GB $136.25 per GB
Pricier than about 90% of the 3,251 comparable items (median $6.75 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameLenovo
Model name4 × 77B09751
Part number4 × 77B09751
Total capacity32 GB

Questions about this item

How much heat and power does a 32GB PC5-6400 module draw when the system runs all day?

The module is rated for the PC5-6400 data rate; actual thermals and power depend on the host platform and workload.

Which Lenovo server models are confirmed to accept the 4X77B09751 32GB kit?

The manufacturer highlights SR635 V3 and SR655 V3 as compatible platforms for this part number.

Will a 2RX8 16Gb density stick work alongside older 1RX8 modules already in my SR635 V3?

Mixing ranks and densities is governed by the server BIOS and memory controller; consult the system memory population rules before installing.

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