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Four green DDR3 ECC DIMMs with gold contacts

OWC

OWC OWC1333D3W4M16K 16GB (4×4GB) DDR3 1333MHz ECC DIMM memory upgrade

SKU CH-51YP-T49BY MPN OWC1333D3W4M16K

16 GB DDR3 ECC kit (four 4 GB DIMMs, 1333 MHz, CL9) for 2009-2012 Mac Pro Xeon systems

  • Capacity16GB (4 x 4GB)
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL9
  • ECCYes
  • Buffered/RegisteredUnbuffered

Capacity 16GB (4 x 4GB)

Struck-through versions exist but are not stocked here.

  • 16 GB total capacity across four matched 4 GB modules
  • DDR3 1333 MHz speed with PC3-10600 rating for Mac Pro systems
  • ECC unbuffered design protects data integrity in workstation workloads
  • CL9 CAS latency at 1.5 V standard voltage
  • Compatible with 2009-2012 Mac Pro models including PC3-8500 1066 MHz backward compatibility

Mac Pro 2009-2012 memory kit

This kit supplies 16 GB of DDR3-1333 ECC unbuffered memory in four 4 GB DIMMs. It is built for Mac Pro models released between 2009 and 2012 that require 240-pin PC3-10600 modules with CL9 timing and 1.5 V operation.

Suits owners of compatible Mac Pro towers

The modules fit Early 2009 and Mid 2010 through Mid 2012 Mac Pro systems, including quad-core, 6-core, 8-core and 12-core Xeon configurations. Builders using later Mac Pro models, non-Mac workstations or platforms that need registered or non-ECC DDR3 should look elsewhere.

Steady throughput for multi-core workloads

Four matched DIMMs populate all channels on supported Mac Pro boards, letting the memory subsystem sustain its rated 1333 MHz speed under continuous load. ECC protection corrects single-bit errors during long render, compute or virtualisation sessions without dropping clock rates.

Highlights

  • 16 GB total capacity across four matched 4 GB modules
  • DDR3 1333 MHz speed with PC3-10600 rating for Mac Pro systems
  • ECC unbuffered design protects data integrity in workstation workloads
  • CL9 CAS latency at 1.5 V standard voltage
  • Compatible with 2009-2012 Mac Pro models including PC3-8500 1066 MHz backward compatibility

Specifications

Capacity16GB (4 x 4GB)
SpeedDDR3 1333 (PC3 10600)
CAS LatencyCL9
ECCYes
Buffered/RegisteredUnbuffered

Other versions of this model

1 more in the same range

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

Questions about this item

Do I need a Mac Pro with 240-pin DDR3 slots to use this 16GB kit?

Yes, this kit uses 240-pin DDR3 DIMMs that require a Mac Pro with matching DDR3 memory slots.

Will these 1333MHz modules run at 1066MHz in my Early 2009 Mac Pro?

Yes, the kit is backward compatible with PC3-8500 1066MHz Mac Pro models and will operate at the slower speed.

How can I verify the 16GB kit is running at CL9 latency after installation?

Open System Report in macOS and check the Memory section; each 4GB module should show 1333MHz speed and CAS latency 9.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

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