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Two green 204-pin DDR3 SO-DIMM sticks in a pair

Axiom

Axiom MC701G/A-AX 16GB (2 x 8GB) DDR3 1333 204-pin SO-DIMM memory upgrade

SKU CH-MPX9-69X87 MPN MC701G/A-AX

16 GB DDR3 1333 dual-channel SO-DIMM kit for 2011 iMac 21.5 and 27 inch models

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • Buffer typeUnbuffered
  • Product type204-Pin DDR3 SO-DIMM
  • Compatible withApple: iMac (21.5 in, Mid 2011) Apple: iMac (27 in, Mid 2011
  • Boost multitasking with 16 GB total capacity
  • Designed for 21.5-inch and 27-inch iMac (Mid 2011)
  • DDR3 1333 MHz speed matches original specs
  • Two 8 GB SO-DIMM modules for dual-channel performance
  • 204-pin unbuffered non-ECC format installs directly

16 GB DDR3 SO-DIMM kit for 2011 iMac

This kit supplies 16 GB of DDR3-1333 memory in two 8 GB modules built to the 204-pin SO-DIMM form factor. It is intended for owners of the 21.5-inch and 27-inch iMac models released in mid-2011 who want to maximise the memory capacity those systems can accept.

Replaces the factory 4 GB or 8 GB configuration

The upgrade is worthwhile when the existing modules limit multitasking or prevent the Mac from reaching its supported 16 GB ceiling. If the machine already runs 16 GB of DDR3-1333, this kit adds no benefit.

Installs through the bottom memory door

The SO-DIMM slots are accessed by removing the RAM access panel on the underside of the iMac; no tools beyond a Phillips screwdriver are required. The most common issue is inserting a module at an angle so the 204-pin edge connector does not seat fully, which causes the system to recognise only one stick or fail to boot.

How it compares

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

Price $113.99
Cheaper than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.12 per GB
Cheaper than about 57% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameAxiom
Model nameMC701G/A-AX
Total capacity16 GB (2 × 8 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
Buffer typeUnbuffered
Size & build
Shipping weight0.09 kg
Package size152 × 76 × 25 mm
Compatibility
Compatible withApple: iMac (21.5 in, Mid 2011)
Apple: iMac (27 in, Mid 2011)

Questions about this item

Will the 204-pin SO-DIMM modules fit the memory slots in my Mid 2011 iMac?

Yes, the 204-pin DDR3 SO-DIMM form factor matches the slots used in both the 21.5-inch and 27-inch iMac models from Mid 2011.

What is the correct way to seat the modules, and what step do people often miss?

Insert each module at an angle until the gold contacts are fully hidden, then press down firmly until the side clips click into place; the click confirms the module is locked.

Will these non-ECC unbuffered modules need any firmware updates or replacement over time?

No firmware updates are required; the modules are passive components with no moving parts, so they do not wear out and typically last for the life of the iMac.

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