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Silver rectangular server processor with gold contact pads and green substrate visible

Lenovo

Lenovo Xeon 6138T 20-core 2.0 GHz server processor

SKU CH-J35Y-DBD9Z MPN 6138T

A 20-core Xeon server processor running at 2.0 GHz with 27.5 MB L3 cache, 125 W TDP and Socket 3647 for Lenovo ThinkSystem ST550 upgrades

  • Product name6138T
  • CPU cores20-Core
  • TDP rating125 W
  • Working frequency2.0 GHz
  • L1 cache size20 MB
  • Level 2 cache20 MB
  • 20 cores handle parallel workloads efficiently
  • Base clock of 2.0 GHz delivers steady compute throughput
  • 5 MB L3 cache reduces memory latency for large datasets
  • 125 W TDP balances performance with thermal limits
  • Socket 3647 fits Lenovo ThinkSystem ST550 server platforms

Socket 3647 compatibility

This processor upgrade fits the Lenovo ThinkSystem ST550 server and uses the LGA 3647 socket. It delivers 20 cores at a 2.0 GHz base frequency with a 3.70 GHz maximum turbo speed. The 14 nm manufacturing process supports 64-bit workloads for data-centre and hybrid-cloud deployments.

Workload fit

Suited for compute-intensive tasks such as virtualisation, database serving and network functions that benefit from high core counts and 27.5 MB L3 cache. Not suited for builds that require a different socket, lower thermal output or a processor without Lenovo qualification.

Thermal design power

The 125 W TDP and 86 °C thermal specification define the cooling capacity the server must provide. This single figure determines whether the existing chassis and fan configuration can support the upgrade.

How it compares

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

Price $71.99
Cheaper than about 97% of the 621 comparable items (median $1,561.99).
CPU cores 20-Core
Lower than about 57% of the 386 comparable items (median 24).
TDP rating 125 W
Lower than about 80% of the 395 comparable items (median 200 W).

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Specifications

Product
Brand nameLenovo
Product lineXeon
Product name6138T
Performance
Working frequency2.0 GHz
Processor
CPU cores20-Core
TDP rating125 W
L1 cache size20 MB
Level 2 cache20 MB
Level 3 cache27.5 MB
Process node14 nm
64-bit capableYes

Questions about this item

How much heat does the 125 W TDP generate when the Xeon 6138T runs continuously?

The processor has a thermal design power of 125 W and a maximum thermal specification of 86 °C (186.8 °F), so the cooler must dissipate at least 125 W sustained.

What motherboard socket is required for the Xeon 6138T to function?

This CPU fits only Socket 3647 (LGA 3647); the board must provide that exact socket.

Will the Xeon 6138T work in a ThinkSystem ST550 that already has an older Xeon installed?

The processor is listed as compatible with the Lenovo ThinkSystem ST550 server; verify the system BIOS supports the 6138T before installing.

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