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Four green DDR3 SO-DIMM sticks, 204-pin, no heat spreaders

Computer Memory Solutions

Computer Memory Solutions 16GB (4×4GB) DDR3 1066MHz CL7 SO-DIMM for iMac 21.5" Late 2009

SKU CH-K7BF-D199P

A 16GB kit of four 4GB DDR3 1066MHz CL7 SO-DIMM modules for the 21.5-inch iMac Late 2009

  • Total capacity16 GB (4 × 4 GB)
  • Rated speedDDR3 1066 (PC3 8500)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 16 GB kit upgrades iMac to maximum supported memory
  • 4 × 4 GB modules fill all four SO-DIMM slots
  • DDR3 1066 MHz CL7 matches original specification
  • 204-pin unbuffered non-ECC design installs without changes
  • Guaranteed compatible with Late 2009 21.5" iMac

16GB DDR3 kit for Late 2009 iMac

This 16GB kit contains four 4GB DDR3 1066MHz CL7 SO-DIMM modules built for the 21.5-inch iMac (Late 2009). It matches the factory memory specification exactly and uses unbuffered, non-ECC chips at 1.5V. The 204-pin form factor fits the four SO-DIMM slots in that model.

Replaces the stock 4GB configuration

The iMac shipped with 4GB as two 2GB modules, leaving two slots empty. This kit fills all four slots to reach the 16GB maximum the system supports. The upgrade is worthwhile when macOS or applications show memory pressure with the original amount installed.

Suits owners of the 21.5-inch Late 2009 iMac

Buyers with a different iMac year, screen size or Mac model cannot use these modules. The DDR3 1066MHz specification and 204-pin SO-DIMM format are specific to the identified system. Anyone needing ECC, registered memory or a different speed should look elsewhere.

How it compares

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

Price $79.99
Cheaper than about 70% 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 $5.00 per GB
Cheaper than about 77% 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 nameCM512648500SODRH
Total capacity16 GB (4 × 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" 3.33 21.5 in (Late 2009)
In the box
Included items4 Memory RAM Sticks

Questions about this item

Will these 204-pin SO-DIMM sticks fit the four slots in my Late 2009 21.5-inch iMac?

Yes, the 204-pin DDR3 SO-DIMM form factor matches the four memory slots in the iMac "Core 2 Duo" 3.33 21.5-Inch (Late 2009) models MC413LL/A, iMac10,1 and A1311.

What is the correct way to seat each 4 GB module so the iMac recognises all 16 GB?

Power off, unplug, lay the iMac face-down on a soft cloth, remove the memory access door, press each module firmly into a slot until the side clips click, then replace the door before turning the Mac back on.

Do these unbuffered non-ECC sticks need any firmware updates or periodic replacement?

No firmware update is required; the CL7 1.5 V modules run at the native 1066 MHz speed. They have no heat spreaders or moving parts, so no scheduled replacement is needed under normal use.

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