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Green 204-pin DDR3 SO-DIMM module with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 4GB DDR3 1333 CL7 SODIMM 204-pin 1.5V 2Rx8 memory upgrade

SKU CH-F650-HTR9P

4GB DDR3 1333MHz CL7 SODIMM for 27-inch 2011 iMac Core i5 3.1GHz systems

  • Total capacity4 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4GB DDR3 1333 MHz CL7 boosts responsiveness for the 27-inch iMac (Mid-2011)
  • 5 V unbuffered SODIMM fits the 204-pin slot without extra power draw
  • 2Rx8 dual-rank organisation lets the memory controller interleave accesses
  • Guaranteed compatibility with Apple iMac Core i5 3.1 (MC814BZ/A)
  • Single 4 GB module expands the system toward the 32 GB maximum

4GB DDR3 1333 CL7 SODIMM for 2011 iMac

This 204-pin DDR3 SO-DIMM module delivers 4GB of unbuffered memory at 1333 MHz with CL7 timing and 1.5V operation. It is built with major-brand chips in a 2Rx8 configuration and carries a lifetime warranty from the manufacturer. The stick is validated for the Apple iMac "Core i5" 3.1 27-Inch (Mid-2011) MC814BZ/A.

Who this suits and who should look elsewhere

The module suits owners of the specified 27-inch 2011 iMac who need a single 4GB upgrade to fill one of the four memory slots. Buyers with other iMac models, different DDR generations, or systems requiring ECC or registered memory cannot use this part. It also does not suit anyone needing a 1600 MHz rated module despite the manufacturer highlight mentioning DDR3-12800.

Deciding specification

The validated compatibility with the Apple iMac "Core i5" 3.1 27-Inch (Mid-2011) MC814BZ/A is the single specification that determines whether this upgrade will work in your system.

How it compares

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

Price $17.99
Cheaper than about 92% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.50 per GB
Cheaper than about 81% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM5126410600SODRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL7
Memory timings7-7-7
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Imac "Core I5 in 3.1 27 in (Mid-2011) Mc814Bz/A
In the box
Included items1 Memory RAM Stick

Questions about this item

Will this 204-pin DDR3 SO-DIMM fit the memory slots in my Mid-2011 27-inch iMac?

Yes, the module matches the 204-pin DDR3 SO-DIMM form factor required by the iMac "Core i5" 3.1 27-Inch (Mid-2011) MC814BZ/A, which has four SO-DIMM sockets supporting up to 32 GB total.

What is the correct way to install this SODIMM in the 2011 iMac, and what step do people often miss?

Power off and unplug the iMac, lay it screen-down on a soft cloth, remove the bottom memory access door, insert the module at an angle until the gold contacts are hidden, then press down firmly until both side clips click — the step many miss is pressing hard enough to engage both clips.

Does this 1.5 V CL7 module need any firmware updates or matching pairs to run reliably over time?

No firmware update is needed; the Mac will detect the 1333 MHz CL7 timing automatically. It runs as a single 4 GB stick, so no matching pair is required, and the unbuffered non-ECC design has no moving parts or batteries to replace.

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