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Two green DDR3 SO-DIMM sticks side by side

Computer Memory Solutions

Computer Memory Solutions CM10246410600SODRH 16GB (2x8GB) DDR3 1333MHz SO-DIMM iMac 21.5 MC812LL/A

SKU CH-ASW1-4C3KT

16 GB DDR3 kit with two 8 GB SO-DIMM modules at 1333 MHz for 21.5-inch iMac MC812LL/A

  • 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 kit (2 × 8 GB) doubles capacity to 16 GB
  • DDR3 1333 MHz PC3-10600 matches factory speed spec
  • CL9 9-9-9 timing at 1.5 V for stable operation
  • 204-pin SO-DIMM form factor fits iMac 21.5-inch MC812LL/A slot
  • Guaranteed compatible with listed Apple iMac 21.5 and 27-inch models

16GB DDR3 1333 SO-DIMM kit

This 16GB kit contains two 8GB DDR3 SO-DIMM modules rated at 1333MHz with CL9 timing. It is built for the Apple iMac 21.5-inch 2.7GHz Intel Core i5 model MC812LL/A and other listed iMacs. The unbuffered non-ECC design matches the original specification for these systems.

204-pin unbuffered layout

Each stick uses a standard 204-pin SO-DIMM edge connector without a heat spreader, fitting the slim iMac memory slots directly. Major-brand DRAM chips are used throughout. The 1.5V operating voltage matches the factory requirement, so installation is a simple module swap with no extra configuration.

Check iMac model and slot count

Verify your iMac identifier matches MC812LL/A, MC813LL/A, MC814LL/A or the 27-inch 3.1GHz and 3.4GHz models listed. These machines accept up to 32GB across four sockets, so a 16GB two-module kit leaves two slots free. Buyers needing 32GB in a single purchase or wanting ECC registered memory should look elsewhere.

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 21.5 in 2.7 GHz Intel Core I5 (Mc812Ll/A)
In the box
Included items2 Memory RAM Sticks

Questions about this item

What DDR3 standard and speed does this 204-pin SO-DIMM kit run at?

The kit uses PC3-10600 DDR3 at 1333 MHz with CL9 9-9-9 timings and 1.5 V unbuffered operation.

Will the two 8 GB sticks fit the memory slots in my 21.5-inch iMac (MC812LL/A)?

Yes, each module is a 204-pin DDR3 SO-DIMM without a heat spreader, matching the four SO-DIMM sockets in that iMac model.

How do I install the modules in the 21.5-inch iMac and what step is often missed?

Power off, unplug, lay the iMac face down on a soft cloth, remove the bottom memory door, insert both sticks until they click, replace the door, then reconnect power.

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