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Two green DDR3 SO-DIMM sticks with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 4GB (2×2GB) DDR3 1333 PC3-10600 SO-DIMM for iMac 21.5" Mid-2011

SKU CH-PG4T-SE78D

A 4 GB kit of two 2 GB DDR3 1333 SO-DIMM modules built for the 21.5-inch iMac (Mid-2011)

  • Capacity4GB (2 x 2GB)
  • Type204-Pin DDR3 SO-DIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL7
  • Timing7-7-7
  • Voltage1.5V
  • 4GB dual-channel kit boosts iMac responsiveness
  • DDR3-1333 CL7 timing matches factory specifications
  • 204-pin SO-DIMM form factor fits Mid-2011 21.5-inch iMac slots
  • 5 V unbuffered non-ECC design ensures stable operation
  • Two 2 GB modules from major-brand chipset for reliability

Targeted iMac Upgrade

This kit delivers 4 GB of DDR3 memory in two 2 GB SO-DIMM modules built for the 21.5-inch Mid-2011 iMac with a 2.5 GHz Core i5. Unbuffered, non-ECC chips run at 1333 MHz with CL7 timing at 1.5 V. The 204-pin form factor fits the factory slots without modification.

Ideal for Mid-2011 Owners

Owners of the specified iMac model seeking a straightforward capacity increase will find guaranteed compatibility and a lifetime warranty from the manufacturer. Systems already at the maximum supported memory or users needing ECC registered modules should consider other options.

Capacity and Limits

The 4 GB total spreads across two ranks per module, providing the density this platform accepts. Everyday multitasking and period-correct applications run comfortably within this limit. Workloads demanding larger datasets or modern virtualisation will exhaust the available headroom quickly.

Puntos fuertes

  • 4GB dual-channel kit boosts iMac responsiveness
  • DDR3-1333 CL7 timing matches factory specifications
  • 204-pin SO-DIMM form factor fits Mid-2011 21.5-inch iMac slots
  • 5 V unbuffered non-ECC design ensures stable operation
  • Two 2 GB modules from major-brand chipset for reliability

Especificaciones

BrandComputer Memory Solutions
ModelCM2566410600SODRH
Capacity4GB (2 x 2GB)
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 "Core I5" 2.5 21.5-Inch (Mid-2011)
Package Content2 Memory RAM Sticks

Preguntas sobre este artículo

My iMac currently has 4 GB of memory installed; will adding this 4 GB kit bring the total to 8 GB?

Yes, the kit adds two 2 GB modules for 4 GB total, so a system that already has 4 GB will reach 8 GB once both slots are filled.

Does the CL7 latency of these modules match the timing of the original Apple memory in the Mid-2011 iMac?

The modules run at CL7 with 7-7-7 timing at 1333 MHz, which is the standard specification for this iMac model.

After installation, how can I confirm the Mac recognises both 2 GB sticks at 1333 MHz?

Open About This Mac → Memory; it should show 4 GB total with two 2 GB DDR3 1333 modules listed.

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