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Four green DDR3 SODIMM sticks with black chips

A-Tech

A-Tech 16GB Kit (4x4GB) DDR3 1333MHz SODIMM 204-Pin Memory Upgrade

SKU CH-J8VE-7MKSJ

16GB kit of four 4GB DDR3 1333MHz SODIMM modules for 2010-2011 iMac models

  • Total capacity16 GB (4 × 4 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16GB kit expands multitasking headroom with four 4GB modules
  • DDR3 1333MHz PC3-10600 speed matches iMac factory spec
  • 204-pin SODIMM form factor fits 21.5 and 27-inch Mid 2010 and 2011 iMacs
  • Non-ECC unbuffered 2Rx8 design ensures stable operation in supported Apple systems
  • Lifetime warranty and US-based tech support back every A-Tech memory upgrade

16GB DDR3 kit for 2010-2011 iMac

This 16GB kit contains four 4GB DDR3 1333MHz SODIMM modules built for specific Apple iMac models from Mid 2010 and Mid-to-Late 2011. It uses unbuffered non-ECC memory with a 2Rx8 rank configuration and runs at 1.50V. The kit matches Apple order numbers including MC309LL/A, MC812LL/A through MC814LL/A, and MD063LL/A.

Suits owners of listed 21.5-inch and 27-inch iMacs

The modules are validated for iMac model identifiers iMac11,2, iMac11,3, iMac12,1 and iMac12,2 covering EMC numbers 2389, 2390, 2428 and 2429. Buyers with iMacs outside these model years or identifiers should verify compatibility before purchasing. Systems requiring ECC or registered memory cannot use this kit.

204-pin DDR3 1333MHz SODIMM form factor

The memory uses the 204-pin SO-DIMM form factor operating at DDR3 1333MHz (PC3-10600). This physical interface and signalling standard determines whether the modules fit and function in the target iMac slots.

How it compares

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

Price $57.99
Cheaper than about 76% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (4 × 4 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $3.62 per GB
Cheaper than about 86% 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 capacity16 GB (4 × 4 GB)
Performance
Rated speedDDR3 1333 (PC3 10600)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Will the 204-pin SODIMM modules need replacement after years of 1.50V operation?

These DDR3 modules run at the standard 1.50 volts and are unbuffered non-ECC; they have no moving parts and A-Tech backs them with a lifetime warranty.

What limit appears first when all four 4GB sticks run at 1333 MHz continuously?

The iMac memory controller caps total capacity at 16 GB, so the 4×4 GB kit already hits that ceiling before bandwidth or heat become bottlenecks.

How much extra heat or fan noise does the 16 GB kit add during all-day workloads?

The modules lack heat spreaders and draw standard DDR3 power, so the iMac’s existing cooling handles the load without audible fan-speed changes.

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