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Two green circuit boards with black memory chips and gold edge connectors

Computer Memory Solutions

Computer Memory Solutions CM10246410600SODRH 16GB (2x8GB) DDR3 1333MHz SO-DIMM memory upgrade

SKU CH-6GV5-QH6TM

16 GB dual-channel DDR3 kit for the mid-2011 21.5-inch iMac Core i5 2.5

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL9
  • Memory timings9-9-9
  • Rated voltage1.5 V
  • 16 GB total capacity delivered as a matched pair of 8 GB modules
  • DDR3 1333 MHz speed rated at PC3-10600 for responsive system performance
  • 204-pin SO-DIMM form factor fits the iMac 21.5-inch Mid-2011 memory slots
  • CL9 9-9-9 timing at 1.5 V provides stable unbuffered non-ECC operation
  • Guaranteed compatible with Apple iMac Core i5 2.5 21.5-inch Mid-2011 A1311

Product identity

This kit delivers 16 GB of DDR3 1333 MHz memory in two 8 GB SO-DIMM modules. It is built for the Apple iMac Core i5 2.5 21.5-Inch Mid-2011 and uses 204-pin unbuffered non-ECC chips at 1.5 V with CL9 timing.

Who it suits

Owners of the specified iMac model who need the maximum 16 GB upgrade from a trusted brand will find guaranteed compatibility. Buyers who want more storage, a different memory generation, ECC support or modules for any other system should look elsewhere.

Installation notes

The SO-DIMM slots are accessible behind the memory door on the bottom edge of the iMac; no tools are required beyond a Phillips screwdriver for the door. The usual issue is failing to seat both modules fully until the latches click, which leaves the system seeing only half the expected capacity.

How it compares

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

Price $47.99
Cheaper than about 78% 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 $3.00 per GB
Cheaper than about 90% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM10246410600SODRH
Total capacity16 GB (2 × 8 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL9
Memory timings9-9-9
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Imac "Core I5 in 2.5 21.5 in (Mid-2011)
In the box
Included items2 Memory RAM Sticks

Questions about this item

Do I need a 2011 iMac with four SO-DIMM slots to use both 8GB modules from this 16GB kit?

The kit is validated for the Mid-2011 21.5-inch iMac which has four slots and a 32GB maximum, so both 8GB modules will be recognised when all slots are populated.

Will these CL9 1333MHz modules run at the correct speed if I leave older CL11 1333MHz sticks in the other two slots?

The memory controller will operate all installed modules at the lowest common speed and latency, so the CL9 sticks will drop to CL11 timing to match the older pair.

How can I confirm the full 16GB is active after installing the two 8GB sticks?

Open About This Mac or System Report; it should show 16GB total memory with two 8GB DDR3 1333MHz modules listed in the memory slot detail.

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