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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

  • Capacity8GB (2 x 4GB)
  • Type204-Pin DDR3 SO-DIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL7
  • Timing7-7-7
  • Voltage1.5V
  • 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.

Highlights

  • 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)

Specifications

BrandComputer Memory Solutions
ModelCM5126410600SODRH
Capacity8GB (2 x 4GB)
Type204-Pin DDR3 SO-DIMM
SpeedDDR3 1333 (PC3 10600)
CAS LatencyCL7
Timing7-7-7
Voltage1.5V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Imac 21.5-Inch 2.5Ghz Intel Core I5 (MC309LL/A)
Package Content2 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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