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Two green DDR3 SODIMM modules with black chips and gold contacts

Computer Memory Solutions

Computer Memory Solutions 4GB (2x2GB) DDR3 1333MHz SODIMM memory upgrade

SKU CH-JJ3G-QKG07

Dual 2 GB DDR3-1333 SO-DIMM kit for the 21.5-inch Mid-2011 iMac Core i7 2.8

  • Total capacity4 GB (2 × 2 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4GB kit (2×2 GB) expands iMac memory to 32 GB max
  • 1333 MHz DDR3 with CL7 timing speeds up data access
  • 204-pin SO-DIMM form factor fits Mid-2011 21.5-inch iMac slot
  • 5 V unbuffered non-ECC design matches factory specification
  • Major-brand chipset and lifetime warranty back long-term reliability

4GB DDR3 kit for 2011 iMac

This 4GB kit contains two 2GB DDR3 1333MHz SO-DIMM modules built for the Apple iMac "Core i7" 2.8 21.5-Inch (Mid-2011). It uses 204-pin unbuffered non-ECC memory running at 1.5V with CL7 timing. The kit suits owners of that specific iMac model who want to add or replace memory using parts validated for the system.

Guaranteed compatibility and lifetime warranty

Computer Memory Solutions guarantees compatibility with the listed iMac model, reducing the risk of boot issues or instability. The two-module kit enables dual-channel operation on the four-slot board. A limited lifetime warranty applies when purchased directly from the manufacturer, and the major-brand chipset aims to deliver reliable long-term operation.

Check your iMac model and slot count

Verify that your iMac is the Mid-2011 21.5-inch model with a 2.8GHz Core i7 processor (model identifiers iMac12,1 or A1311) before ordering. The system supports a maximum of 32GB across four sockets, so this 4GB kit leaves room for further expansion. Buyers needing more than 32GB total or a different DDR generation cannot use this product.

How it compares

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

Price $13.99
Cheaper than about 94% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB (2 × 2 GB)
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $3.50 per GB
Cheaper than about 87% 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 nameCM2566410600SODRH
Total capacity4 GB (2 × 2 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 I7 in 2.8 21.5 in (Mid-2011)
In the box
Included items2 Memory RAM Sticks

Questions about this item

Will the 204-pin DDR3 SODIMM modules ever need replacing under normal use?

DDR3 memory has no moving parts and no wear-out mechanism, so the two 2GB sticks should last the life of the iMac unless physically damaged.

What stops me from adding more than the 4GB in this kit?

The Mid-2011 21.5-inch iMac has four SODIMM slots and a 32GB maximum, so you can populate the two empty slots later.

How much heat and power do the 1.5V CL7 modules produce when the iMac runs all day?

At 1.5V and standard DDR3 1333 speeds, the unbuffered sticks draw only a few watts and stay cool without a heat spreader.

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