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Green rectangular DDR5 memory module with gold contacts and black chips no heat spreader

OWC

OWC 64GB DDR5 4800 CL40 2Rx4 ECC RDIMM memory upgrade

SKU CH-S7BQ-FCYRP

A 64GB DDR5 4800 CL40 ECC registered RDIMM for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • Total capacity64 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB

  • 64 GB capacity expands server memory headroom
  • DDR5 4800 MT/s speed boosts data throughput
  • CL40 latency with 1.1 V operation balances performance and efficiency
  • ECC registered design detects and corrects single-bit errors
  • Qualified for ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3, SR665 V3

64GB DDR5 ECC RDIMM for ThinkSystem servers

This 64GB DDR5 4800 CL40 registered ECC module is built for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers. It targets IT teams who need to expand memory capacity in these specific platforms with a single high-density DIMM.

288-pin installation and mixing constraints

The module fits a standard 288-pin DDR5 RDIMM slot and requires no tools beyond normal DIMM seating. It will not work in standard desktop computers and must not be mixed with unbuffered or load-reduced ECC memory, as the registered buffer changes the electrical interface.

DDR5 4800 registered ECC limits

Registered ECC adds a clock cycle of buffering that stabilises large memory arrays but prevents use in consumer platforms that expect unbuffered DIMMs. The DDR5 4800 JEDEC speed sets the maximum data rate; the module will down-clock if the server memory controller runs at a lower frequency.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $1,322.99
Pricier than about 63% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $20.67 per GB
Pricier than about 66% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R464 GB
Total capacity64 GB
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo 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

Questions about this item

How can I verify the module is running at 4800 MT/s with CL40 after installation?

Check the BIOS or a hardware-monitoring tool; the SPD should report DDR5-4800 PC5-38400 and CAS latency 40.

What comes in the package and do I need any extra parts?

One 64 GB 288-pin ECC registered DIMM is included; no cables or brackets are required, just an available RDIMM slot.

Which capacity should I pick for a ThinkSystem SR650 V3?

This is a single 64 GB module; add as many as the server's memory channels allow to reach your target capacity.

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