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Computer Memory Solutions

Computer Memory Solutions 16GB (4x4GB) DDR3 1333MHz SODIMM for iMac 27 2.7GHz MC813LL/A

SKU CH-G41S-Y6R8X

Four 4 GB DDR3 SO-DIMM modules at 1333 MHz upgrade the iMac 27-inch 2.7 GHz MC813LL/A to 16 GB total capacity

  • Total capacity16 GB (4 × 4 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 16 GB kit fills all four slots on the 27-inch iMac
  • DDR3 1333 MHz CL7 timing matches the 2.7 GHz MC813LL/A specification
  • 5 V unbuffered non-ECC modules install without BIOS changes
  • Major-brand chips validated for the 27-inch 2.7 GHz and 3.1 GHz iMac models
  • Lifetime warranty from Computer Memory Solutions covers the 4-piece kit

What this kit is and who it fits

This 16 GB kit contains four 4 GB DDR3 1333 MHz SO-DIMM modules built for the Apple iMac 27-inch 2.7 GHz Intel Core i5 model MC813LL/A. It also matches the 3.1 GHz MC814LL/A and 3.4 GHz Core i7 variants. The modules are unbuffered, non-ECC, run at 1.5 V and use a 204-pin layout with CL7 timing.

What to verify before ordering

Confirm your iMac is one of the three listed model numbers and that all four SO-DIMM slots are free for the upgrade. The system must accept DDR3 1333 (PC3-10600) memory at 1.5 V without ECC or registered buffering. Apple officially supports 16 GB in these models, though the hardware may address more.

Who this suits and who should look elsewhere

Ideal for owners of the compatible 27-inch iMacs who want to reach the official 16 GB limit using a matched four-module kit. Not suitable for any other Mac, PC laptop or desktop that requires a different DDR generation, voltage, pin count, ECC support or a smaller module count.

How it compares

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

Price $69.99
Cheaper than about 73% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (4 × 4 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $4.37 per GB
Cheaper than about 82% 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 nameCM5126410600SODRH
Total capacity16 GB (4 × 4 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 27 in 2.7 GHz Intel Core I5 (Mc813Ll/A)
In the box
Included items4 Memory RAM Sticks

Questions about this item

Does the kit include everything needed to fill all four memory slots in the iMac 27 MC813LL/A, or must I buy additional modules?

The package contains four 4 GB SODIMM sticks, matching the four slots of the MC813LL/A, so no extra modules are required to reach the 16 GB total.

Should I choose this 1333 MHz CL7 kit or look for a different speed or latency for the iMac 27 2.7 GHz model?

This 1333 MHz CL7 kit matches the DDR3 1333 specification Apple lists for the MC813LL/A, making it the correct speed and latency for that system.

Will the 16 GB total from this kit be fully recognised and usable once installed in the iMac 27 MC813LL/A?

Apple officially supports 16 GB for the MC813LL/A, and the kit provides exactly 16 GB across four slots, so the full capacity will be recognised.

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