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
Two green DDR5 RDIMM modules with gold contacts, no heat spreader

OWC

OWC 128GB (2x64GB) DDR5 4800 CL40 ECC RDIMM 2Rx4 1.1V ThinkSystem SR635/645/650/655/665 V3

SKU CH-XQGR-4JF32

128 GB DDR5-4800 ECC registered RDIMM kit for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 128GB (2 x 64GB)

  • 128 GB capacity expands server memory headroom with a 2 x 64 GB kit
  • DDR5 4800 speed delivers PC5-38400 bandwidth for data-intensive workloads
  • ECC registered design detects and corrects errors to protect critical data integrity
  • 1 V operation reduces power draw per module in dense configurations
  • Validated for ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

Server-specific ECC RDIMM kit

This 128 GB kit contains two 64 GB DDR5 4800 CL40 registered ECC modules built for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers. The 288-pin RDIMMs operate at 1.1 V and use a 2Rx4 organisation. They are not compatible with standard desktop motherboards or with unbuffered or load-reduced memory types.

Sustained load behaviour

Registered buffering places a register between the DRAM and the memory controller, reducing electrical load on the command bus during continuous operation. ECC circuitry corrects single-bit errors and detects multi-bit errors without halting the system. The 1.1 V JEDEC voltage keeps power draw stable across extended workloads in multi-socket server platforms.

DDR5 RDIMM interface limits

The DDR5 4800 PC5-38400 standard defines the maximum data rate and timing envelope for these modules; higher speeds or lower latencies require platform and firmware support beyond the JEDEC base specification. Mixing registered DIMMs with unbuffered or load-reduced DIMMs is not supported by the memory controller. Capacity expansion depends on the number of DIMM slots and the qualified memory population rules for each ThinkSystem model.

Highlights

  • 128 GB capacity expands server memory headroom with a 2 x 64 GB kit
  • DDR5 4800 speed delivers PC5-38400 bandwidth for data-intensive workloads
  • ECC registered design detects and corrects errors to protect critical data integrity
  • 1 V operation reduces power draw per module in dense configurations
  • Validated for ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

Specifications

BrandOWC
Part Number4R8D52R4128P
Capacity128GB (2 x 64GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SR635 V3
Lenovo ThinkSystem SR645 V3
Lenovo ThinkSystem SR650 V3
Lenovo ThinkSystem SR655 V3
Lenovo ThinkSystem SR665 V3

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

How much heat does the 1.1 V DDR5 4800 kit produce in a ThinkSystem SR650 V3 running continuously?

The modules operate at 1.1 V with no heat spreader, so they rely on the server’s airflow; power draw follows the JEDEC DDR5 4800 specification.

What must the server already have to accept this 2Rx4 registered ECC kit?

The ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 or SR665 V3 must support DDR5 4800 registered ECC RDIMMs and have free 288-pin slots.

Can the 64 GB 2Rx4 modules sit beside older DDR5 RDIMMs in the same ThinkSystem SR635 V3?

They can share a channel if the existing RDIMMs are also registered ECC at 4800 MT/s; mixing with unbuffered or load-reduced DIMMs is not supported.

Also in this aisle

People compared these

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