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Two green SO-DIMM sticks with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions CM512648500SODRH 8GB (2x4GB) DDR3 1066MHz CL7 1.5V 204-pin SO-DIMM memory upgrade

SKU CH-SZ4S-DHZT2

A 1066 MHz DDR3 SO-DIMM kit adding 8 GB across two 4 GB modules for the Late 2009 21.5-inch iMac

  • 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 Late 2009 iMac to 16GB max
  • Two 4GB DDR3 1066MHz CL7 modules install in free slots
  • 5V unbuffered non-ECC SO-DIMM matches factory spec
  • 204-pin form factor fits Apple iMac Core 2 Duo 3.06 21.5
  • Major-brand chips backed by CMS lifetime warranty

Apple iMac Late 2009 upgrade

This 8 GB kit contains two 4 GB DDR3 SO-DIMM modules built for the 21.5-inch iMac Core 2 Duo 3.06 GHz model MB950LL/A. The sticks run at 1066 MHz with CL7 timing and 1.5 V unbuffered operation. They fill the two empty slots on a system that ships with 4 GB installed.

Sustained workload behaviour

At DDR3-8500 speed the modules deliver steady throughput for everyday multitasking, media playback and light creative work. The 7-7-7 latency helps keep response consistent when several applications share the 16 GB maximum capacity. No heat spreader is fitted, so airflow in the iMac chassis handles thermal load.

Build and connectors

Each stick uses a standard 204-pin SO-DIMM edge connector that slots directly into the iMac memory bays. Major-brand DRAM chips are used throughout and the kit carries a limited lifetime warranty from Computer Memory Solutions. Buyers needing ECC error correction or registered buffering should look elsewhere, as this kit is non-ECC and unbuffered.

How it compares

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

Price $39.99
Cheaper than about 80% 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 $5.00 per GB
Cheaper than about 77% 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 MB950LL/A
In the box
Included items2 Memory RAM Sticks

Questions about this item

Does the 1.5 V DDR3-1066 kit run hot or loud when the iMac is under load all day?

The modules are unbuffered, non-ECC SO-DIMMs without a heat spreader, so they add no fan noise and rely on the iMac's existing airflow; typical DDR3 power draw at 1.5 V stays low during continuous use.

What must the Late 2009 21.5-inch iMac (MB950LL/A) already have for this 2 × 4 GB kit to work?

The iMac ships with 4 GB in two 2 GB sticks and two empty 204-pin slots; simply insert both 4 GB modules into the free slots — no tools, firmware updates or extra hardware are required.

Will the CL7 1066 MHz sticks down-clock reliably alongside the original 1066 MHz memory Apple installed?

Yes, all four modules share the same DDR3-1066 speed and 1.5 V voltage, so the memory controller runs the full 8 GB at the stock 1066 MHz CL7 timing without manual adjustment.

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