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Two green DDR3 SO-DIMM sticks, no heat spreaders

Computer Memory Solutions

Computer Memory Solutions 8GB (2x4GB) DDR3 1333MHz CL7 SO-DIMM iMac 21.5" Mid-2011

SKU CH-VS2H-WBX72

An 8 GB kit of two 4 GB DDR3 1333 MHz SO-DIMM modules built for the 21.5-inch iMac from Mid-2011

  • Capacity8GB (2 x 4GB)
  • Type204-Pin DDR3 SO-DIMM
  • SpeedDDR3 1333 (PC3 10600)
  • CAS LatencyCL7
  • Timing7-7-7
  • Voltage1.5V
  • 8 GB dual-channel kit lifts multitasking headroom
  • CL7 7-7-7 timing cuts latency for snappier response
  • 1333 MHz DDR3 matches the iMac mid-2011 memory bus
  • 204-pin SO-DIMM form factor slots straight in
  • Tested compatible with iMac 21.5-inch mid-2011 (MC309LL/A, iMac12,1, A1311)

8GB DDR3 SO-DIMM kit for 21.5-inch iMac (Mid-2011)

This 8GB kit contains two 4GB DDR3 1333MHz SO-DIMM modules built to 204-pin form factor. They run at 1.5V with CL7 7-7-7 timings and are unbuffered non-ECC. The kit is specified for the Apple iMac "Core i5" 2.5 21.5-inch (Mid-2011) models including MC309LL/A and iMac12,1.

Suits owners of the listed 2011 iMac seeking

Builders working on any other desktop, laptop or later iMac cannot use these modules. The 204-pin DDR3 interface and specific timing prevent installation in systems requiring different pin counts, voltages or memory generations. Buyers needing more than 8GB total capacity should look elsewhere.

1333MHz CL7 DDR3 speed grade decides fit

The modules operate at PC3-10600 1333MHz with CAS latency 7. If the target iMac requires this exact speed and latency combination the kit will function as intended. A different speed grade or latency will not match the system requirement.

Highlights

  • 8 GB dual-channel kit lifts multitasking headroom
  • CL7 7-7-7 timing cuts latency for snappier response
  • 1333 MHz DDR3 matches the iMac mid-2011 memory bus
  • 204-pin SO-DIMM form factor slots straight in
  • Tested compatible with iMac 21.5-inch mid-2011 (MC309LL/A, iMac12,1, A1311)

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 "Core I5" 2.5 21.5-Inch (Mid-2011)
Package Content2 Memory RAM Sticks

Questions about this item

How do I confirm the memory is running at 1333 MHz with CL7 timing after installation?

Open System Information on the iMac and check the Memory section; each module should show 1333 MHz speed and 7-7-7 timing.

What is included in the package and do I need any tools or extra parts?

The kit contains two 4 GB DDR3 SO-DIMM sticks; no tools or additional components are required for the iMac's user-accessible memory slots.

Which capacity kit should I choose for the Mid-2011 21.5-inch iMac with four slots?

This 8 GB (2×4 GB) kit fills two of the four slots; add a second identical kit later if you want the maximum 32 GB.

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