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Six green DDR3 ECC registered DIMMs in a row

A-Tech

A-Tech 48GB (6x8GB) DDR3 1066 ECC RDIMM Memory Upgrade

SKU CH-DXAD-G8EVT

A 48GB DDR3 1066 ECC registered kit of six 8GB modules for early 2009 and mid 2010 Apple Mac Pro and Xserve systems

  • Capacity48GB (6 x 8GB)
  • SpeedDDR3 1066 (PC3 8500)
  • Voltage1.50V
  • ECCYes
  • Buffered/RegisteredRegistered
  • ChipsetMajor Brand Chipset
  • 48 GB capacity over six 8 GB modules for high-density workloads
  • DDR3 1066 PC3-8500 speed matches original Apple specifications
  • ECC registered design protects data integrity in critical tasks
  • Validated for Mac Pro Early 2009, Mid 2010 and Xserve Early 2009 systems
  • Lifetime warranty with US-based technical support included

Target systems

This 48 GB kit contains six 8 GB DDR3 1066 MHz ECC registered DIMMs built for the Mac Pro Early 2009 eight-core, Mac Pro Mid 2010 eight-core, Xserve Early 2009 four-core and Xserve Early 2009 eight-core. The modules run at 1.50 V and use 240-pin RDIMM form factor with 2Rx4 organisation. They match Apple order numbers MB449LL/A, MB535LL/A and MC561LL/A.

Fit and alternatives

The kit suits owners of the listed Mac Pro and Xserve models who need the maximum 48 GB capacity in a single matched set. Systems that require unbuffered memory, non-ECC modules, a different DDR generation, or fewer than six slots should look elsewhere. Machines not identified by the compatible model IDs MacPro4,1, MacPro5,1 or Xserve3,1 are not supported.

Deciding specification

The registered ECC RDIMM design is the single specification that decides compatibility; only Mac Pro and Xserve models that accept DDR3 1066 MHz PC3-8500 registered ECC memory can use this kit.

Highlights

  • 48 GB capacity over six 8 GB modules for high-density workloads
  • DDR3 1066 PC3-8500 speed matches original Apple specifications
  • ECC registered design protects data integrity in critical tasks
  • Validated for Mac Pro Early 2009, Mid 2010 and Xserve Early 2009 systems
  • Lifetime warranty with US-based technical support included

Specifications

BrandA-Tech
SeriesA-Tech DDR3 Apple Mac RAM Memory Upgrades
Capacity48GB (6 x 8GB)
SpeedDDR3 1066 (PC3 8500)
Voltage1.50V
ECCYes
Buffered/RegisteredRegistered
ChipsetMajor Brand Chipset
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

Questions about this item

How do I install the six 240-pin RDIMM modules in my Mac Pro (Early 2009, 8-Core) and what slot order avoids the common error?

Power down, open the side door, unlock both memory risers, then populate the six slots in matched pairs starting with the innermost slot on each riser; the system requires identical 8 GB modules per channel, so mixing capacities in the same channel prevents boot.

What maintenance or replacement will the ECC registered DDR3 kit need during its service life?

No routine maintenance is required; if a module fails the lifetime warranty covers replacement, but the registered DDR3 1066 standard is no longer produced so an exact match must come from remaining new-old-stock inventory.

Which limit appears first when the 1.50 V registered memory runs sustained workloads on a 2.26 GHz Xeon E5520?

The memory controller caps bandwidth at PC3-8500 speeds, so throughput saturates before thermal throttling or voltage limits become factors under continuous load.

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