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Two green 204-pin DDR3 SODIMM sticks side by side

Computer Memory Solutions

Computer Memory Solutions 16GB (2x8GB) DDR3-1333 SODIMM for iMac 21.5" Late 2011

SKU CH-HKPG-PWNM1

16 GB kit (two 8 GB DDR3-1333 SO-DIMMs) for upgrading the 21.5-inch Late 2011 iMac to 16 GB total

  • Capacity16GB (2 x 8GB)
  • Type204-Pin DDR3 SO-DIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL9
  • Timing9-9-9
  • Voltage1.5V
  • 16GB kit boosts multitasking on Late 2011 iMac
  • DDR3 1333MHz CL9 matches factory timing exactly
  • 204-pin SODIMM form factor fits 21.5-inch model
  • Unbuffered non-ECC design installs without configuration
  • Two 8GB modules populate dual-channel slots

System-specific DDR3 kit

This 16 GB kit contains two 8 GB DDR3-1333 SODIMM modules built for the 21.5-inch iMac released in late 2011. Each stick runs at 1.5 V with CL9 timing and uses a 204-pin unbuffered layout. The memory is designed to match the exact electrical and physical requirements of that single Apple model.

204-pin SODIMM form factor

Modules follow the standard notebook SODIMM outline so they seat directly into the iMac’s four memory slots without adapters. No heat spreader is fitted, keeping the profile low enough for the slim all-in-one chassis. Major-brand DRAM chips are used across both sticks to maintain consistent signal integrity at 1333 MHz.

Two-module upgrade path

The pair delivers 16 GB total and leaves two slots free if the system maximum of 32 GB is ever needed. Computer Memory Solutions backs the kit with a limited lifetime warranty when purchased directly from them. Package contents are limited to the two memory sticks; no tools or software are included.

Points forts

  • 16GB kit boosts multitasking on Late 2011 iMac
  • DDR3 1333MHz CL9 matches factory timing exactly
  • 204-pin SODIMM form factor fits 21.5-inch model
  • Unbuffered non-ECC design installs without configuration
  • Two 8GB modules populate dual-channel slots

Caractéristiques

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 i3" 3.1 21.5-Inch (Late 2011)
Package Content2 Memory RAM Sticks

Questions sur cet article

What DDR3 speed and PC3 rating does this kit run at?

The modules are DDR3-1333 rated at PC3-10600 with CL9 9-9-9 timings.

Does this 204-pin SODIMM kit fit the iMac 21.5-inch Late 2011 memory slots?

Yes, the 204-pin DDR3 SO-DIMM form factor matches the four slots in the iMac 21.5-inch Late 2011 (A1311).

How do I install the two 8 GB sticks, and what step is often missed?

Power off, unplug, lay the iMac face-down, remove the bottom memory door, insert both modules until they click, then replace the door before turning it on.

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