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Two green DDR3 SO-DIMM memory modules with gold contacts

Computer Memory Solutions

Computer Memory Solutions 8GB (2x4GB) DDR3 1333MHz SO-DIMM for iMac 21.5" Mid-2010

SKU CH-RS8S-ADQYB

8GB kit of two DDR3 1333MHz SO-DIMM modules for the 21.5-inch iMac from mid-2010

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 8GB dual-channel kit doubles iMac memory capacity
  • CL7 timing at 1333MHz delivers responsive DDR3 performance
  • 5V unbuffered modules install without configuration
  • 204-pin SO-DIMM form factor matches mid-2010 iMac slots
  • Major-brand chipset ensures reliable operation in Apple systems

Compatible iMac Upgrade Kit

This 8 GB kit contains two 4 GB DDR3 SO-DIMM modules built for the 21.5-inch iMac released in mid-2010 with a 3.2 GHz Core i3 processor. The modules run at 1333 MHz with CL7 timing and operate at the standard 1.5 V. They are unbuffered, non-ECC and use a 204-pin layout.

Replaces Factory 4 GB Configurations

The mid-2010 iMac shipped with 4 GB across four slots; this kit fills two slots to double the baseline capacity. The jump is worthwhile when macOS or creative applications show memory pressure on the stock amount. Maximum supported memory for this model is 16 GB, so two additional slots remain open for further expansion.

Suits Owners of the Listed iMac

Buyers with the exact mid-2010 21.5-inch Core i3 iMac (model identifiers MC509LL/A, iMac11,2, A1311) can install these modules with guaranteed compatibility. Builders working on any other Mac, PC laptop or desktop should look elsewhere because the DDR3 SO-DIMM pinout and timing are specific to this system.

How it compares

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

Price $35.99
Cheaper than about 82% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB (2 × 4 GB)
Lower than about 80% 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 capacity8 GB (2 × 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 "Core I3 in 3.2 21.5 in (Mid-2010)
In the box
Included items2 Memory RAM Sticks

Questions about this item

Will the 204-pin SO-DIMM modules fit the memory slots in my 21.5-inch Mid-2010 iMac?

Yes, the 204-pin DDR3 SO-DIMM form factor matches the four slots inside the 21.5-inch Mid-2010 iMac.

Which side of the module clicks in first when I install the RAM in the bottom slot?

Insert the gold-edge connector at a slight angle, then press down evenly until both retention clips snap shut; the notch near the centre prevents backward insertion.

When should I consider replacing these 1.5 V DDR3 modules?

Replace them only if the iMac fails to boot, shows repeated kernel panics or memory errors after testing each stick individually.

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