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Two green 204-pin DDR3 SO-DIMM sticks, no heat spreaders, 16GB kit

Computer Memory Solutions

Computer Memory Solutions 16GB (2x8GB) DDR3 1333 SO-DIMM iMac 21.5 Mid-2011

SKU CH-EYXH-BHQ9Y

A 16 GB dual-channel DDR3 1333 SO-DIMM kit built for the 21.5-inch 2011 iMac with a 2.7 GHz Core i5

  • Capacity16GB (2 x 8GB)
  • Type204-Pin DDR3 SO-DIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL9
  • Timing9-9-9
  • Voltage1.5V
  • 16 GB kit upgrades the 21.5-inch Mid-2011 iMac to its 32 GB maximum
  • Two 8 GB modules populate two of the four SO-DIMM slots
  • DDR3 1333 MHz CL9 timing matches the factory specification
  • 5 V unbuffered non-ECC design installs without configuration
  • 204-pin SO-DIMM form factor fits the iMac memory compartment

Compatible iMac memory kit

This 16 GB kit contains two 8 GB DDR3 SO-DIMM modules rated at 1333 MHz. It is built for the Apple iMac 21.5-inch Mid-2011 model with a 2.7 GHz Core i5 processor. The unbuffered, non-ECC sticks run at 1.5 V with CL9 timings.

Upgrading from the factory 4 GB

The iMac shipped with 4 GB across two slots; this kit fills all four sockets and reaches the 16 GB ceiling for this configuration. The jump is worthwhile when macOS, creative apps or virtual machines regularly exhaust the original memory and cause swapping.

Check your exact model identifier

Confirm the machine shows iMac12,1 and part number MC812LL/A in About This Mac before ordering. The system supports a maximum of 32 GB across four slots, so this 16 GB kit leaves room for a future matched pair if needed.

Puntos fuertes

  • 16 GB kit upgrades the 21.5-inch Mid-2011 iMac to its 32 GB maximum
  • Two 8 GB modules populate two of the four SO-DIMM slots
  • DDR3 1333 MHz CL9 timing matches the factory specification
  • 5 V unbuffered non-ECC design installs without configuration
  • 204-pin SO-DIMM form factor fits the iMac memory compartment

Especificaciones

BrandComputer Memory Solutions
ModelCM10246410600SODRH
Capacity16GB (2 x 8GB)
Type204-Pin DDR3 SO-DIMM
SpeedDDR3 1333 (PC3 10600)
CAS LatencyCL9
Timing9-9-9
Voltage1.5V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Imac "Core I5" 2.7 21.5-Inch (Mid-2011)
Package Content2 Memory RAM Sticks

Preguntas sobre este artículo

Does this 204-pin DDR3 SO-DIMM kit fit the four memory slots in the 21.5-inch Mid-2011 iMac?

Yes. The kit provides two 8 GB modules for the four SO-DIMM slots in the 21.5-inch Mid-2011 iMac, bringing total memory to 16 GB against a 32 GB maximum.

What is the correct way to seat these unbuffered CL9 modules so the iMac recognises the full 16 GB?

Power off and unplug the iMac, remove the memory access door, insert each module at a slight angle until the gold contacts are hidden, then press down firmly until both side clips click.

When should the two 8 GB sticks be replaced if the iMac starts showing memory errors?

Replace them if Apple Diagnostics reports a memory failure or the system kernel-panics repeatedly; the modules carry a limited lifetime warranty from Computer Memory Solutions.

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