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Two green DDR3 SO-DIMM sticks, 204-pin, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 8GB (2x4GB) DDR3 1333 Apple iMac Core i5 2.5 21.5 Mid-2011 memory upgrade

SKU CH-WYYF-M7FFD

8GB dual-channel kit of 204-pin DDR3 1333 SO-DIMMs for mid-2011 21.5-inch Core i5 iMac

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 8GB kit expands the iMac to its 32GB maximum
  • 1333 MHz DDR3 matches the original memory speed
  • CL7 timing keeps latency low for responsive multitasking
  • 204-pin SO-DIMM form factor fits the Mid-2011 iMac slots exactly
  • Guaranteed compatibility with iMac 12,1 (MC309LL/A, A1311)

Targeted Upgrade

This 8GB kit supplies two 4GB DDR3 SO-DIMMs built for the 21.5-inch iMac with a 2.5 GHz Core i5 from Mid-2011. The modules match the factory PC3-10600 specification and 204-pin form factor. Owners of that exact model can install both sticks to reach the system's supported capacity.

Steady Operation

Rated at 1333 MHz with CL7 timings, the memory maintains its rated speed during extended workloads without downclocking. Unbuffered, non-ECC chips and 1.5V operation keep latency consistent across long rendering or virtualisation sessions. The 2Rx8 organisation supports the platform's dual-channel architecture throughout sustained use.

Thermal Profile

Without a heat spreader, the modules rely on the iMac's internal airflow to stay within safe limits. Standard DDR3 power draw at 1.5V produces modest heat that the stock cooling handles quietly. No additional fan noise or temperature spikes appear during typical desktop and creative workloads.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $35.99
Cheaper than about 82% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB (2 × 4 GB)
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $4.50 per GB
Cheaper than about 81% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM5126410600SODRH
Total capacity8 GB (2 × 4 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL7
Memory timings7-7-7
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Imac "Core I5 in 2.5 21.5 in (Mid-2011)
In the box
Included items2 Memory RAM Sticks

Questions about this item

Does the 1.5 V DDR3-1333 kit run noticeably hotter or louder than the original modules during long sessions?

The modules have no heat spreader and draw standard 1.5 V DDR3 power, so they add minimal heat and produce no noise of their own.

My Mid-2011 iMac currently has two 2 GB sticks — do I need to remove them before installing this 2×4 GB kit?

Yes, the iMac has four SO-DIMM slots and supports up to 32 GB; you can keep the existing sticks if free slots remain, but replacing them gives a cleaner 8 GB total.

Will these CL7 204-pin SO-DIMMs work reliably alongside the original 1333 MHz memory already in my iMac?

They match the factory DDR3-1333 speed and 204-pin form factor, so the system will run all populated slots at the common 1333 MHz rate without timing conflicts.

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