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
Four green DDR3 ECC registered DIMMs with gold contacts

OWC

OWC 64GB DDR3 1333 PC3-10600 CL9 2Rx4 240-pin 1.5V ECC Registered RDIMM Memory Upgrade Kit

SKU CH-WX66-FZB86

Four 16 GB DDR3 ECC registered DIMMs at 1333 MHz for Lenovo System x3950 X5

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latencyCL9
  • Rated voltage1.5 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (4 x 16GB)

  • ECC registered design protects data integrity in server workloads
  • 64 GB kit (4 × 16 GB) expands Lenovo System x3950 X5 capacity
  • DDR3 1333 PC3-10600 CL9 matches original system specifications
  • 5 V 240-pin RDIMM form factor installs directly in compatible slots
  • Replaces Lenovo part numbers 03X3813 and 0A89413 for validated compatibility

Server-grade ECC memory kit

This 64 GB kit contains four 16 GB DDR3 1333 modules built to PC3-10600 CL9 timings at 1.5 V. Each stick is a 240-pin registered ECC RDIMM with 2Rx4 organisation. The set is validated for the Lenovo System x3950 X5 and replaces Lenovo part numbers 03X3813 and 0A89413.

Passive thermals and power profile

No heat spreader is fitted so airflow from the server chassis handles cooling directly across the DRAM. Registered buffering reduces electrical load on the memory controller, helping keep power draw predictable in multi-DIMM configurations. Operation stays within standard DDR3 1.5 V limits.

Build integration and constraints

Four populated slots are required so the target platform must expose at least that many 240-pin DDR3 sockets. The modules are incompatible with unbuffered desktop boards and cannot be mixed with non-ECC memory. Buyers needing consumer DDR3 or higher-density single modules should look elsewhere.

How it compares

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

Price $182.99
Cheaper than about 59% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $2.86 per GB
Cheaper than about 90% of the 20,941 comparable items (median $8.19 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 nameOWC
Part number1R3D32R4064S
Total capacity64 GB (4 × 16 GB)
Product type240-Pin DDR3 ECC RDIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latencyCL9
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsLenovo System x3950 X5

Other versions of this model

5 more in the same range

Questions about this item

How do I install the four 16 GB DDR3 1333 RDIMMs in a Lenovo System x3950 X5, and what step is often missed?

Power down the server, open the chassis, and seat each 240-pin module firmly until the ejector clips click; the step often missed is populating all four slots in the matched-channel order shown in the x3950 X5 service guide so the 64 GB kit runs at the rated PC3-10600 speed.

What maintenance or replacement will the OWC 64 GB DDR3 ECC Registered kit need over its service life?

The modules have no heat spreaders and no moving parts, so no routine maintenance is required; replacement is only necessary if a DIMM fails, at which point OWC's Advanced Replacement programme supplies a new 16 GB RDIMM of the same PC3-10600 CL9 specification.

What limit appears first when the x3950 X5 runs sustained workloads with this 64 GB DDR3 1333 CL9 kit?

The memory bus tops out at 1333 MT/s and CL9 latency, so bandwidth and latency ceilings are reached before the 1.5 V registered DIMMs hit any thermal or power limit.

More in Model-Specific Memory Upgrades

Similar items