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Two green DDR3 SO-DIMM sticks in anti-static bag

Computer Memory Solutions

Computer Memory Solutions 8GB (2x4GB) DDR3 1066MHz CL7 SO-DIMM iMac 21.5" Late 2009

SKU CH-2K70-W4MRW

8GB DDR3 1066MHz CL7 SO-DIMM kit (2×4GB) validated for 21.5-inch iMac Late 2009

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR3 1066 (PC3 8500)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 8GB kit upgrades the Late 2009 iMac 21.5" beyond factory 4GB
  • DDR3 1066MHz CL7 matches Apple's original memory specification exactly
  • 204-pin SO-DIMM form factor fits the iMac's memory slots directly
  • Unbuffered non-ECC design ensures full compatibility with Core 2 Duo systems
  • Two 4GB modules provided for dual-channel performance in the iMac's four slots

iMac Late 2009 Memory Kit

This 8 GB kit contains two 4 GB DDR3 SO-DIMM modules built for the Apple iMac "Core 2 Duo" 3.06 21.5-Inch (Late 2009). It matches the factory specification of PC3-8500 speed, CL7 latency and 1.5 V operation. The 204-pin unbuffered, non-ECC design installs directly into the two free slots.

DDR3 SO-DIMM Interface Constraints

The 204-pin SO-DIMM form factor fits only notebook and all-in-one sockets wired for DDR3 signalling. PC3-8500 modules run at 1066 MHz; faster DDR3 sticks will down-clock but cannot exceed the platform’s native bus. Total system capacity is capped at 16 GB across four slots, so this kit leaves two slots open.

16 GB System Limit Decides Fit

The iMac 10,1 (A1311) officially supports a maximum of 16 GB, so this 8 GB kit suits users who need a mid-range upgrade without filling every slot. Buyers who want the full 16 GB must add a second identical kit. Systems already at the 16 GB ceiling cannot use these modules.

How it compares

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

Price $36.99
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 $4.62 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 nameCM512648500SODRH
Total capacity8 GB (2 × 4 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1066 (PC3 8500)
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 2 Duo" 3.06 21.5 in (Late 2009)
In the box
Included items2 Memory RAM Sticks

Questions about this item

Should I pick the 8GB kit or look for a larger capacity for my late 2009 iMac?

The iMac supports up to 16GB across four slots. This 8GB kit fills two slots, leaving two free for a future upgrade to the maximum.

What does the 1066MHz rating mean once the modules are installed in the iMac?

The memory will run at 1066MHz with CL7 timing at 1.5V, matching the speed the late 2009 iMac expects for DDR3 SO-DIMM modules.

Will the 204-pin DDR3 SO-DIMM interface work without issues in the 21.5-inch late 2009 iMac?

Yes, the 204-pin DDR3 SO-DIMM form factor is the exact interface used by the iMac10,1 (A1311) and the modules are unbuffered, non-ECC as required.

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