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Two green circuit boards with black memory chips and gold edge connectors

Computer Memory Solutions

Computer Memory Solutions CM5126410600SODRH 8GB DDR3 1333MHz 2x4GB SODIMM memory upgrade

SKU CH-7D8M-9GV1Q

Two 4 GB DDR3-1333 SO-DIMM modules upgrade compatible Apple iMac 21.5-inch systems

  • 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 boosts multitasking headroom
  • 1333 MHz DDR3 speed matches factory spec
  • CL7 latency tightens response times
  • 204-pin SODIMM form factor fits iMac slots
  • Tested for Apple iMac 21.5-inch 2.5 GHz Intel Core i5 (MC309LL/A)

8GB DDR3 SO-DIMM kit for Apple iMac

This 8GB kit contains two 4GB DDR3-1333 SO-DIMM modules built to the PC3-10600 standard. They run at 1.5V with CL7 7-7-7 timings and use an unbuffered, non-ECC 204-pin layout. The package is intended as a direct memory upgrade for compatible Apple iMac desktops.

Suits owners of listed iMac models needing 8GB

The modules are validated for the iMac 21.5-inch 2.5GHz Core i5 (MC309LL/A), 21.5-inch 2.7GHz Core i5 (MC812LL/A), 21.5-inch 2.8GHz Core i7, 27-inch 2.7GHz Core i5 (MC813LL/A), 27-inch 3.1GHz Core i5 (MC814LL/A) and 27-inch 3.4GHz Core i7. Buyers with systems that require ECC or registered memory, or laptops and other desktops not in the compatibility list, should look elsewhere.

204-pin DDR3 SO-DIMM form factor decides fit

Each stick uses the 204-pin DDR3 SO-DIMM interface, which is physically and electrically distinct from other memory types. Only machines that accept DDR3 SO-DIMM modules at 1333MHz can use this kit; the pin count and notch position prevent insertion into incompatible slots.

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).

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 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 21.5 in 2.5 GHz Intel Core I5 (MC309LL/A)
In the box
Included items2 Memory RAM Sticks

Questions about this item

How do I install the 204-pin DDR3 SO-DIMM modules in my iMac, and what step do people often miss?

Power off and unplug the iMac, remove the memory access door on the bottom edge, eject the existing modules by spreading the side clips, align the notch on each 204-pin stick with the slot key, press firmly until the clips snap shut, then replace the door before powering on.

What maintenance or replacement will this 1.5V DDR3 1333MHz kit need over time?

No routine maintenance is required; keep the interior dust-free and ensure the cooling vents stay clear so the unbuffered modules remain within thermal limits.

What limit appears first when the 2Rx8 CL7 memory runs sustained workloads on a 21.5-inch iMac?

The memory controller caps bandwidth at DDR3-10600 speeds, so sustained throughput cannot exceed the 1333 MHz data rate regardless of load duration.

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