We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green bare DDR4 RDIMM module 64GB 288 pin

OWC

OWC 64GB DDR4 3200 CL22 ECC Registered RDIMM for Lenovo ThinkSystem SR635 SR655 SR850 SR860

SKU CH-S21A-8V1C9
  • Capacity64GB
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 3200 (PC4 25600)
  • CAS LatencyCL22
  • Voltage1.2V
  • ECCYes

Capacity 64GB

  • 64 GB capacity expands server memory headroom
  • DDR4 3200 speed delivers high bandwidth throughput
  • ECC registered design protects data integrity
  • 2 V operation reduces power consumption
  • Validated for Lenovo ThinkSystem SR635 SR655 SR850 SR860

Capacity and Compatibility

This 64GB DDR4 ECC Registered RDIMM is built for Lenovo ThinkSystem SR635, SR655, SR850 and SR860 servers. It targets administrators upgrading memory capacity in those specific platforms. Buyers who need unbuffered memory for desktop or consumer workstations cannot use this module.

Speed and Voltage Limits

The module runs at DDR4 3200 (PC4 25600) with CL22 latency at 1.2V. JEDEC compliance ensures operation within that rated speed and voltage envelope. Systems that require faster data rates or lower latency timings will not benefit beyond this specification.

Pre-Installation Checks

Verify the server model matches the listed ThinkSystem variants and that the memory slots accept 288-pin Registered DIMMs. Existing modules must also be ECC Registered; mixing with unbuffered memory is not supported. Confirm the platform uses Xeon SP Gen 2 processors for SR850 and SR860 compatibility.

Highlights

  • 64 GB capacity expands server memory headroom
  • DDR4 3200 speed delivers high bandwidth throughput
  • ECC registered design protects data integrity
  • 2 V operation reduces power consumption
  • Validated for Lenovo ThinkSystem SR635 SR655 SR850 SR860

Specifications

BrandOWC
Part Number3R2D42R464GB
Capacity64GB
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 3200 (PC4 25600)
CAS LatencyCL22
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SR635
Lenovo ThinkSystem SR655
Lenovo ThinkSystem SR850 (Xeon SP Gen 2)
Lenovo ThinkSystem SR860 (Xeon SP Gen 2)

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Should I pick a single 64GB module or combine smaller DIMMs for the ThinkSystem SR635?

A single 64GB DDR4 3200 CL22 registered ECC RDIMM fills one slot and matches the server's qualified configuration; adding smaller DIMMs would require matching rank, voltage and speed exactly.

What does the 3200 MT/s rating deliver inside a Lenovo SR850 Xeon SP Gen 2 system?

The module runs at DDR4 3200 (PC4 25600) with CL22 latency at 1.2V, providing the maximum JEDEC-standard throughput the platform's memory controller supports for registered ECC DIMMs.

Does the 288-pin DDR4 RDIMM interface limit total memory capacity on the SR655?

The 288-pin registered ECC RDIMM fits the SR655's DDR4 slots; total capacity is capped by the server's maximum DIMM count and the CPU's memory controller, not by the module's pinout.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.