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Four green DDR3 SODIMM modules in a row

A-Tech

A-Tech 16GB Kit (4x4GB) DDR3 1866MHz SODIMM 204-Pin Memory Upgrade for Apple iMac (Late 2015)

SKU CH-R49C-JQ1T6

Adds 16 GB of DDR3L 1866 MHz memory to a Late 2015 27-inch iMac using four 4 GB SODIMM modules

  • Capacity16GB (4 x 4GB)
  • SpeedDDR3L 1866 (PC3L 14900)
  • Voltage1.35V
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • Rank1Rx8
  • 16 GB kit speeds up multitasking on 27-inch iMac
  • DDR3L 1866 MHz matches Apple Late 2015 spec
  • 35 V low-voltage modules reduce power draw
  • Four 204-pin SODIMMs fill every slot
  • Tested for iMac17,1 and order numbers MK462LL/A MK472LL/A MK482LL/A

Targeted Upgrade Kit

This 16 GB kit contains four 4 GB DDR3L SODIMM modules rated at 1866 MHz PC3-14900 and 1.35 V. It is built for the Apple iMac Retina 5K 27-inch Late 2015 (model ID iMac17,1, EMC 2834, order numbers MK462LL/A, MK472LL/A, MK482LL/A).

System-Level Effect

Filling all four slots with matched 1Rx8 unbuffered modules lets the memory controller run in quad-channel mode, raising bandwidth for multitasking and large-file workflows. The low-voltage DDR3L parts also reduce heat output compared with standard 1.5 V DDR3.

Installation Notes

The iMac 27-inch Late 2015 requires removing the display assembly to reach the SO-DIMM slots, so anti-static precautions and a suction-cup tool are essential. Common issues include seating modules unevenly, which causes a boot chime loop, and mixing these sticks with existing 1.5 V DDR3, which forces the bus to the higher voltage and can destabilise the system.

Punti di forza

  • 16 GB kit speeds up multitasking on 27-inch iMac
  • DDR3L 1866 MHz matches Apple Late 2015 spec
  • 35 V low-voltage modules reduce power draw
  • Four 204-pin SODIMMs fill every slot
  • Tested for iMac17,1 and order numbers MK462LL/A MK472LL/A MK482LL/A

Caratteristiche tecniche

BrandA-Tech
SeriesA-Tech DDR3 Apple Mac RAM Memory Upgrades
Capacity16GB (4 x 4GB)
SpeedDDR3L 1866 (PC3L 14900)
Voltage1.35V
ECCNo
Buffered/RegisteredUnbuffered
Rank1Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

Domande su questo articolo

Will the 1.35 V DDR3L modules need any voltage adjustment or replacement over time?

The kit runs at the standard 1.35 V DDR3L voltage used by the iMac (Late 2015), so no manual adjustment is required and the modules are designed for the system's full service life.

What limit appears first when the 1866 MHz memory runs sustained workloads on this iMac?

The iMac's memory controller caps operation at 1866/1867 MHz, so the modules will not exceed that speed even under continuous load.

How much extra heat or fan noise do the four 4 GB sticks add during all-day use?

The unbuffered DDR3L SODIMMs have no heat spreaders and draw only 1.35 V, so they add minimal thermal load and do not increase fan speed in the iMac's chassis.

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