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Four green DDR3L ECC registered DIMMs, 240-pin, no heat spreaders

OWC

OWC 64GB (4x16GB) DDR3L 1600 CL11 ECC RDIMM 1.35V 240-pin

SKU CH-K1EN-4T56C

Adds 64 GB of DDR3L 1600 ECC registered memory across four 16 GB modules for compatible Lenovo ThinkServer models

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR3L 1600 (PC3L 12800)
  • CAS latencyCL11
  • Rated voltage1.35 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (4 x 16GB)

  • ECC registered design protects data integrity in servers
  • 64GB kit with four 16GB modules expands capacity
  • DDR3L 1600 CL11 at 1.35V lowers power draw
  • 240-pin RDIMM fits ThinkServer RD540 RD630 RD640 TD330 TD340
  • Replaces Lenovo part numbers 0C19535 46W0671 46W0672

Server memory upgrade kit

This 64GB kit contains four 16GB DDR3L 1600 ECC registered DIMMs built for Lenovo ThinkServer RD540 RD630 RD640 TD330 and TD340 systems. It runs at 1.35V with CL11 latency and a 2Rx4 organisation. The modules are designed for workstation and server platforms that require registered memory with error correction.

Compatibility and installation checks

Verify that your ThinkServer model is listed and that the motherboard accepts 240-pin DDR3L ECC RDIMMs at 1.35V. Registered memory cannot be mixed with unbuffered modules so all slots must use the same type. Confirm the system BIOS supports the full 64GB capacity across four slots before ordering.

Sustained workload behaviour

ECC registered operation detects and corrects single-bit errors during continuous operation protecting data integrity in server and NAS workloads. The 1.35V DDR3L voltage reduces power draw and heat compared with standard DDR3 helping stability during long compute or virtualisation sessions. JEDEC compliance ensures consistent timing under load.

How it compares

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

Price $198.99
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 $3.11 per GB
Cheaper than about 89% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number1R6T32R4064S
Total capacity64 GB (4 × 16 GB)
Product type240-Pin DDR3L ECC RDIMM
Performance
Rated speedDDR3L 1600 (PC3L 12800)
Memory
CAS latencyCL11
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsLenovo ThinkServer RD540
Lenovo ThinkServer RD630
Lenovo ThinkServer RD640
Lenovo ThinkServer TD330
Lenovo ThinkServer TD340

Other versions of this model

5 more in the same range

Questions about this item

Does the 64GB kit include four 16GB modules or do I need to buy extra sticks?

The kit contains four 16GB DDR3L 1600 CL11 ECC Registered RDIMM modules for a total of 64GB; no additional sticks are required.

Should I choose the 2Rx4 1.35V registered version or a different rank and voltage for my ThinkServer?

Select this 2Rx4 1.35V registered kit; it matches the Lenovo part numbers 0C19535, 46W0671 and 46W0672 for the RD540, RD630, RD640, TD330 and TD340.

What does the PC3L-12800 1600MHz rating mean once the memory is installed in a ThinkServer RD640?

PC3L-12800 1600MHz CL11 indicates the modules run at 1600 MT/s with CAS latency 11 at 1.35V, delivering ECC registered throughput supported by the listed ThinkServer platforms.

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