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Two green DDR3 SODIMM modules with black chips and gold contacts

Computer Memory Solutions

Computer Memory Solutions 8GB (2x4GB) DDR3 1333MHz SODIMM 21.5" iMac memory upgrade

SKU CH-X31Q-KJPHK

8GB DDR3 SODIMM kit (2×4GB) at 1333 MHz for 21.5" iMac Intel Core i3/i5 models

  • 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 dual-channel kit boosts multitasking on 21.5" iMac
  • DDR3-1333 CL7 timing delivers responsive system performance
  • 204-pin SODIMM form factor fits Intel Core i3/i5 models
  • 5V unbuffered non-ECC design matches factory specifications
  • Major-brand chipset ensures reliable long-term operation

System-specific DDR3 SO-DIMM kit

This 8 GB kit contains two 4 GB modules built to the DDR3 1333 standard with CL7 timing and 1.5 V operation. It is assembled for the 21.5" Intel Core i3/i5 iMac and uses 204-pin unbuffered, non-ECC SO-DIMMs from a major brand chipset.

Suits owners of the listed 21.5" iMac

The kit matches the factory slot count and maximum per-slot capacity for that model. Builders working on any other Mac, on a PC laptop, or on a desktop that requires registered or ECC memory should look elsewhere.

204-pin DDR3 1333 SO-DIMM interface

Only systems that accept 204-pin DDR3 1333 unbuffered non-ECC modules can use this kit; the pin count, voltage and signalling standard are fixed and not interchangeable with other memory generations.

How it compares

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

Price $37.99
Cheaper than about 81% 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 $4.75 per GB
Cheaper than about 80% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

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 Intel Core I3/I5 21.5 in
In the box
Included items2 Memory RAM Sticks

Questions about this item

Does the kit include both memory modules or do I need to order a second stick?

The package contains two 4 GB DDR3 SODIMM sticks for a total of 8 GB, so nothing else is required for the upgrade.

Should I choose the 1333 MHz CL7 version or a different speed for my 21.5 inch iMac?

This kit is rated at DDR3 1333 (PC3 10600) with CL7 timing and 1.5 V, matching the specification for the Intel Core i3/i5 21.5 inch iMac.

Will 1333 MHz DDR3 actually run at that speed once installed in the iMac?

The modules operate at DDR3 1333 with CL7 7-7-7 timing at 1.5 V, delivering the rated performance in the compatible iMac.

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