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Two green DDR3L SO-DIMM sticks with black chips

Computer Memory Solutions

Computer Memory Solutions CM5126412800SOSRL 8GB (2x4GB) DDR3L 1600MHz CL11 1.35V memory upgrade

SKU CH-858E-RZ3T8

Two 4 GB DDR3L 1600 MHz SO-DIMM modules add 8 GB to a compatible 27-inch iMac Retina 5K (Mid 2015)

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR3L 1600 (PC3L 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.35 V
  • 8GB kit upgrades your iMac to 32 GB maximum
  • DDR3L 1600 MHz CL11 matches factory speed and timing
  • 35 V low voltage reduces power draw and heat
  • 204-pin SO-DIMM form factor fits the 27-inch Mid-2015 slot exactly
  • Two matched 4 GB modules enable dual-channel performance

Targeted iMac 27-inch 2015 upgrade

This 8GB kit uses two 4GB DDR3L SO-DIMM modules built for the Apple iMac Retina 5K 27-inch (Mid 2015) MF885LL/A. The memory runs at 1600MHz with CL11 timing at 1.35V. It is an unbuffered, non-ECC kit designed for direct installation.

Suits owners of the specified 2015 iMac

Builders working on any other platform, including later iMacs or Windows laptops, should look elsewhere because the DDR3L 204-pin form factor and voltage are specific to this model. Buyers who need ECC or registered memory will not find those features here.

Handles 8GB in a 32GB four-slot system

The kit fills two of the four available slots, leaving room to reach the 32GB maximum if two more matching modules are added. It runs at the rated 1600MHz speed for everyday workloads on this iMac. The 1.35V DDR3L operation matches the system's low-voltage requirement.

How it compares

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

Price $76.99
Cheaper than about 71% 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 $9.62 per GB
Typical for this category: the median of 20,941 items is $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 nameCM5126412800SOSRL
Total capacity8 GB (2 × 4 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3L 1600 (PC3L 12800)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL11
Memory timings11-11-11
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsApple Imac Retina 5K 27 in (Mid 2015) Mf885Ll/A
In the box
Included items2 Memory RAM Sticks

Questions about this item

Will these 204-pin DDR3L 1600MHz modules work in the other two slots of my iMac 15,1 alongside the original 4GB sticks?

Yes, the iMac 15,1 has four SO-DIMM sockets supporting up to 32GB total, so adding this 2x4GB kit to existing modules is fully supported.

What should I check in macOS to confirm both 4GB sticks are running at 1600MHz with CL11 timing?

Open System Report → Memory; each slot should show 4GB DDR3 1600MHz, and the Part Number field will list CM5126412800SOSRL confirming correct speed and timing.

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