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Six green DDR3 ECC DIMMs with black chips and gold contacts

OWC

OWC 48GB (6x8GB) DDR3 ECC CL9 PC3-10600 1333MHz memory upgrade

SKU CH-3RM1-15D4H

48GB DDR3 ECC memory kit with six 8GB modules at 1333MHz CL9 for 2009-2012 Mac Pro models

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

Capacity 48GB (6 x 8GB)

  • 48GB total capacity supports demanding professional workloads
  • Six 8GB DDR3 1333MHz modules populate all memory slots
  • ECC error correction protects data integrity in critical tasks
  • JEDEC and RoHS compliant for reliable Mac Pro operation
  • Backward compatible with 1066MHz Mac Pro systems

48GB DDR3 ECC kit for 2009-2012 Mac Pro

This 48GB kit contains six 8GB DDR3 1333MHz ECC DIMMs built to JEDEC PC3-10600 CL9 specifications. It targets owners of Mac Pro 4,1 and 5,1 models who need the maximum supported memory for virtualisation, large creative projects or scientific workloads. The modules include Mac-qualified thermal sensor EEPROMs for full fan-control compatibility.

Upgrade from 1066MHz or smaller kits

The kit replaces any PC3-8500 1066MHz modules and runs at the native 1333MHz speed of 2010-2012 Mac Pro 5,1 systems. On 2009 Mac Pro 4,1 models the memory operates at 1066MHz, still providing the capacity increase. The jump is worthwhile when your current 12GB or 24GB configuration forces swapping during multi-VM or video-timeline work.

Six-slot capacity with 1333MHz headroom

Six populated slots deliver the full 48GB that the Mac Pro memory controller addresses, leaving no empty sockets for future expansion. The CL9 latency and 1.5V operation match the platform’s design limits, so bandwidth scales with CPU core count up to the 12-core 3.33GHz configurations. Workloads exceeding 48GB must move to a newer architecture.

How it compares

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

Price $184.99
Cheaper than about 59% 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 $3.85 per GB
Cheaper than about 85% 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 typeUnbuffered

Other versions of this model

1 more in the same range

Questions about this item

What Mac Pro models accept the 240-pin DDR3 DIMMs in this kit?

The modules fit Mac Pro models MacPro4,1 and MacPro5,1 from 2009 through 2012, including quad-core, 8-core and 12-core configurations.

Which slot order should I follow when installing the six 8 GB modules?

Populate the four slots on the first riser card before adding modules to the second riser; the system will not recognise memory placed out of sequence.

How can I verify the ECC function is active after installation?

Open System Report on macOS and confirm each DIMM shows ECC status as enabled; the thermal sensor EEPROM also reports temperature to the SMC.

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