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Six green DDR3 ECC UDIMM sticks in silver tray

A-Tech

A-Tech 24GB (6x4GB) DDR3 1333 ECC UDIMM Mac Pro 12-Core 2010/2012 memory upgrade

SKU CH-MP81-56EW5

24GB kit of six 4GB DDR3 1333 ECC UDIMM modules for 12-core Mac Pro 2010 and 2012 models

  • Total capacity24 GB (6 × 4 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Compatible systemsApple Mac Systems
  • 24 GB capacity across six 4 GB modules
  • DDR3 1333 MHz speed rated PC3-10600
  • ECC unbuffered UDIMM with 240-pin form factor
  • Designed for Mac Pro 12-Core 2010 and 2012
  • Tested with major-brand chips for reliability

Mac Pro 12-Core memory upgrade

This 24 GB kit contains six 4 GB DDR3 1333 ECC UDIMM modules built for the 12-Core Mac Pro models released in 2010 and 2012. It matches the Apple order number MD771LL/A and model identifier MacPro5,1. The unbuffered design fits the 240-pin slots used in these towers. Buyers with 4-Core or 8-Core Mac Pro configurations cannot use this kit.

Thermals and power

Each module runs at the standard DDR3 voltage of 1.50 V, keeping power draw consistent with the original factory memory. The unbuffered ECC design adds no extra active components, so heat output stays at the level Apple engineered for the stock cooling system. No additional fan speed or airflow changes are required.

Deciding specification

The kit is validated only for 12-Core Xeon processors including the 2.4 GHz E5645, 2.66 GHz X5650, 2.93 GHz X5670 and 3.06 GHz X5675. Systems equipped with any other CPU are not supported. Confirm the processor model before ordering.

How it compares

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

Price $114.99
Cheaper than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 24 GB (6 × 4 GB)
Lower than about 65% of the 20,941 comparable items (median 32 GB).
Price per GB $4.79 per GB
Cheaper than about 79% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineA-Tech DDR3 Apple Mac RAM Memory Upgrades
Total capacity24 GB (6 × 4 GB)
Performance
Rated speedDDR3 1333 (PC3 10600)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportYes
Buffer typeUnbuffered
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

How do I install the 6x4GB DDR3 1333 ECC UDIMM modules in my Mac Pro 2010/2012 12-Core, and which step do people get wrong?

Power off the Mac Pro, open the side panel, release the memory riser latches, and insert each 240-pin module firmly until the ejectors click; the step often missed is seating all six modules evenly across both risers so the triple-channel architecture operates correctly.

What maintenance or replacement will the 24GB DDR3 1333 ECC UDIMM kit need over time?

The modules are solid-state with no moving parts and require no scheduled maintenance; if a module fails, the ECC function will log corrected errors, and the lifetime warranty covers replacement of the defective 4GB stick.

What limit appears first when the 24GB DDR3 1333 ECC UDIMM kit runs sustained workloads on the 12-Core Mac Pro?

The memory bandwidth ceiling of the DDR3 1333 (PC3-10600) interface is reached before the 24GB capacity fills, so throughput-intensive tasks hit the speed limit first.

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