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Four green DDR4 SODIMM sticks, black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 32GB (4x8GB) DDR4 2400 CL17 SODIMM memory upgrade for Apple iMac 27-Inch 5K Mid-2017

SKU CH-35VJ-WT09V

32 GB kit of four 8 GB DDR4 2400 CL17 SODIMM modules for the 27-inch 5K iMac (Mid 2017)

  • Total capacity32 GB (4 × 8 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • 32 GB total capacity in a 4 x 8 GB kit for full iMac 27-Inch 5K Mid-2017 upgrade
  • DDR4 2400 speed rated at PC4 19200 for responsive multitasking
  • CL17 latency with 17-17-17 timing for stable operation
  • 2 V unbuffered non-ECC modules run cool without a heat spreader
  • 260-pin SODIMM form factor fits the four slots of the compatible iMac model

32GB DDR4 SO-DIMM kit for 27-Inch 5K iMac

This 32GB kit contains four 8GB DDR4 2400 CL17 SO-DIMM modules built for the Apple iMac 27-Inch 5K Mid-2017. The unbuffered non-ECC memory runs at 1.2V with 17-17-17 timings and uses 260-pin DDR4 packaging. Computer Memory Solutions validates compatibility for this specific model.

Suits owners filling all four slots to reach 32GB

Buyers who need the full 64GB maximum supported by this iMac should look at a 64GB kit instead. The kit is not for systems that require ECC or registered memory, nor for any computer other than the Mid-2017 27-Inch 5K iMac.

Four modules populate every available slot

The iMac provides four SO-DIMM sockets and this kit supplies one module for each. Installing all four at once avoids mixing different production batches and ensures the system operates in quad-channel mode at the rated 2400 MHz speed.

How it compares

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

Price $138.99
Cheaper than about 63% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (4 × 8 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $4.34 per GB
Cheaper than about 82% 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 nameCM1024642400SO
Total capacity32 GB (4 × 8 GB)
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL17
Memory timings17-17-17
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple iMac Core i5 3.4 27 in (5K, Mid-2017)
In the box
Included items4 Memory RAM Sticks

Questions about this item

How much heat does this 1.2V DDR4 kit add when the iMac runs all day?

The modules run at 1.2V without a heat spreader, so they add minimal thermal load inside the 27-Inch 5K Mid-2017 chassis.

My iMac 18,3 currently has two empty SODIMM slots — do I need all four sticks?

The kit includes four 8GB modules to fill all four slots, reaching the 32GB total; you can install fewer, but the system will run below the rated capacity.

Will these CL17 sticks work alongside the original Apple memory that shipped at CL15?

Yes, the Mac will clock both sets to the slower CL17 timing automatically, keeping the iMac 27-Inch 5K Mid-2017 stable.

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