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Six green DDR3 240-pin registered DIMMs in a clear tray

OWC

OWC 48GB 6x 8GB DDR3 1333MHz ECC Registered Memory Upgrade OWC1333D3X8M48K

SKU CH-6XZR-XQWHD MPN OWC1333D3X8M48K

48 GB DDR3 1333 MHz ECC registered 6×8 GB kit for 2009-2012 Mac Pro models

  • Total capacity48 GB (6 × 8 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latencyCL9
  • Buffer typeRegistered

Capacity 48GB (6 x 8GB)

  • 48 GB total capacity from six 8 GB modules
  • DDR3 1333 MHz speed rated at PC3-10600 standard
  • ECC registered design protects data integrity in workstations
  • Qualified for Mac Pro models 2009 through 2012
  • CL9 latency at 1.5 V operating voltage

Mac Pro 2009-2012 Memory Kit

This 48GB kit contains six 8GB DDR3 1333MHz ECC Registered DIMMs built for Mac Pro models from 2009 to 2012. It targets owners of MacPro4,1 and MacPro5,1 systems who need the maximum supported capacity. The modules operate at 1.5v with a CL9 latency rating.

Registered ECC Requires Matching Type

These 240-pin DIMMs are ECC Registered and must not be mixed with Unbuffered ECC modules already installed. The Mac Pro will not boot if the two types are combined. Backwards compatibility extends to PC3-8500 1066MHz Mac Pro models. The kit is not designed for typical desktop PCs.

Low-Voltage DDR3 Thermals

Standard DDR3 1.5v operation keeps power draw and heat output modest inside the Mac Pro chassis. Registered buffers add slight electrical load but improve signal integrity at full population. No active cooling is required beyond the system's standard airflow.

How it compares

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

Price $128.99
Cheaper than about 64% of the 21,161 comparable items (median $397.99).
Total capacity 48 GB (6 × 8 GB)
Higher than about 55% of the 20,941 comparable items (median 32 GB).
Price per GB $2.69 per GB
Cheaper than about 91% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Total capacity48 GB (6 × 8 GB)
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latencyCL9
ECC supportYes
Buffer typeRegistered

Other versions of this model

1 more in the same range

Questions about this item

What is the registered buffer limit when all six 8 GB DDR3 1333 MHz modules are installed?

The kit provides 48 GB across six registered DIMMs; each 8 GB module carries its own register, so the registered buffer limit is reached when all slots are populated.

How much power does the 1.5 V DDR3 kit draw and how hot does it run under continuous load?

Each module operates at the standard 1.5 V DDR3 voltage; registered DIMMs typically run slightly warmer than unbuffered parts, but no specific thermal or power figures are published.

Which Mac Pro model identifiers must I already own for this 48 GB kit to work?

Compatible models are MacPro4,1 (Early 2009) and MacPro5,1 (Mid 2010 through Mid 2012); the kit will not boot in other systems.

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