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Two green DDR3 SODIMM modules with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 16GB (2x8GB) DDR3 1333MHz SODIMM for iMac 27-Inch Mid-2011

SKU CH-S62W-BB3BB

A 16GB dual-channel DDR3 1333MHz SODIMM kit for the 27-inch iMac mid-2011

  • 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 dual-channel kit boosts multitasking headroom
  • 1333 MHz DDR3 speed matches iMac Mid-2011 spec
  • 204-pin SODIMM form factor fits the 27-inch slot exactly
  • 5 V unbuffered non-ECC design meets Apple requirements
  • Lifetime warranty from CMS backs long-term reliability

iMac Mid-2011 27-Inch Memory Kit

This 16 GB kit contains two 8 GB DDR3 1333 MHz SODIMM modules built to the PC3-10600 standard. The unbuffered, non-ECC sticks run at 1.5 V with CL9 timing and use 204-pin connectors. They are intended as a direct RAM upgrade for the specified Apple all-in-one desktop.

Suits owners of the named iMac model

The kit matches the Apple iMac "Core i5" 2.7 27-Inch (Mid-2011) identifiers MC813LL/A, iMac12,2 and A1312. Apple officially supports 16 GB in this system; the supplier notes the practical maximum may reach 32 GB across four slots. Buyers with any other Mac model, a different screen size, a Windows laptop or a desktop motherboard should look elsewhere because the pin layout, voltage and firmware expectations differ.

204-Pin DDR3 1333 MHz SODIMM Form Factor

The modules must fit a 204-pin DDR3 SO-DIMM socket operating at 1333 MHz (PC3-10600). If the target machine uses a different pin count, a different DDR generation or a different voltage, the sticks will not seat or will not be recognised. Verify the exact iMac model and slot specification before purchase.

How it compares

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

Price $45.99
Cheaper than about 79% 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 $2.87 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 2.7 27 in (Mid-2011)
In the box
Included items2 Memory RAM Sticks

Questions about this item

Does the 1333 MHz DDR3 speed limit bandwidth before the iMac 27-Inch Mid-2011 processor does?

The modules run at 1333 MHz DDR3, which matches the iMac 27-Inch Mid-2011 memory controller specification, so the memory bus is not the first bottleneck under sustained load.

How much heat do two 1.5 V DDR3 SODIMMs add when the iMac runs all day?

Each stick operates at 1.5 V without a heat spreader; the iMac's internal airflow is designed for this power level, so temperatures stay within the system's normal range during continuous use.

Must the iMac 27-Inch Mid-2011 already have four empty SODIMM slots for this 2 x 8 GB kit to work?

The iMac 27-Inch Mid-2011 has four SODIMM slots and a 32 GB maximum; the 2 x 8 GB kit occupies two slots and works whether the other two are empty or already populated with compatible DDR3 modules.

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