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Two green DDR4 SODIMM sticks, 260-pin, no heat spreader

NEMIX RAM

NEMIX RAM 16GB (2x8GB) DDR4 2400 CL17 SODIMM memory upgrade for Apple iMac 2017 21.5

SKU CH-KNHY-13QZ4

16 GB DDR4 2400 CL17 SODIMM kit (2×8 GB) compatible with 2017 21.5-inch iMac

  • Capacity16GB (2 x 8GB)
  • SpeedDDR4 2400 (PC4 19200)
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • Boosts multitasking with 16 GB dual-channel DDR4 kit
  • Runs cool at 1.2 V for stable iMac operation
  • Tested compatible with 2017 21.5" Retina 4K & non-Retina
  • CL17 latency keeps everyday tasks responsive
  • 260-pin SODIMM fits straight into the memory slots

Apple iMac 2017 21.5 memory kit

This 16 GB kit contains two 8 GB DDR4 2400 SODIMM modules built for the Apple iMac 2017 21.5 inch Retina 4K and non-Retina models. It runs at 1.20 V with CL17 latency and uses unbuffered non-ECC chips from major OEM suppliers. The 260-pin form factor matches the factory SO-DIMM slots exactly.

DDR4 2400 SO-DIMM speed ceiling

The iMac 2017 21.5 inch memory controller is specified for DDR4 2400, so these modules operate at their rated 2400 MT/s without down-clocking. Faster DDR4 2666 parts will still work but will run at the lower 2400 ceiling. The dual-rank 1Rx8 organisation fits the platform's supported density per slot.

Check slot count and maximum capacity

Before ordering, verify how many SO-DIMM slots your specific iMac 2017 21.5 inch unit exposes and what total capacity the firmware accepts. Some configurations ship with soldered memory and only one upgrade slot, while others offer two user-accessible slots. The Apple service manual for your exact model number states the supported maximum.

Highlights

  • Boosts multitasking with 16 GB dual-channel DDR4 kit
  • Runs cool at 1.2 V for stable iMac operation
  • Tested compatible with 2017 21.5" Retina 4K & non-Retina
  • CL17 latency keeps everyday tasks responsive
  • 260-pin SODIMM fits straight into the memory slots

Specifications

BrandNEMIX RAM
SeriesApple iMac/Mac Mini Compatible Series Memory
ModelApple DDR4 2666MHZ ECC Unbuffered SODIMM
Part NumberMS19200-818K2
Capacity16GB (2 x 8GB)
SpeedDDR4 2400 (PC4 19200)
ECCNo
Buffered/RegisteredUnbuffered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemApple
CAS LatencyCL17
Heat SpreaderNo
Type260-PIN DDR4 SODIMM
Rank1Rx8
FeaturesDDR4 Non-ECC Unbuffered SODIMM Motherboard Compatible
Package Content16GB (2X8GB) DDR4 2400MHZ PC4-19200 2Rx8 1.2V CL17 260-PIN Non-ECC Unbuffered SODIMM KIT

Questions about this item

Should I pick the 16GB kit or a single 8GB module for my 2017 iMac 21.5?

The 16GB kit provides two matched 8GB sticks for dual-channel bandwidth, which the iMac 21.5 2017 architecture benefits from. A single module would run in single-channel mode and halve memory throughput.

What does the 2400MHz rating deliver in an actual 2017 iMac 21.5?

The modules run at DDR4-2400 CL17 with 1.2V. The 2017 iMac 21.5 memory controller tops out at 2400MT/s, so you get the full rated speed and latency without down-clocking.

Is the 260-pin SODIMM interface the limiting factor for this upgrade?

The 260-pin DDR4 SODIMM form factor is the correct physical and electrical interface for the 2017 iMac 21.5. It supports the kit's PC4-19200 bandwidth and CL17 timing without any adapter or converter.

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