Can this ram be mixed with apple's pre-installed ram? I've read that crucial memory has not played well with apple ram in the past.

Yes, I am using this RAM for my 2017 27" 5k iMac. Just insert this RAM in the slots that the Apple RAM is currently in, and then insert the Apple RAM in the remaining slots. This ensures the newer and larger RAM modules are used first for better performance.

Is this the same as CT10559857 on crucial.com? because they look like the same as each other, but model number of this item is CT16G4S24AM.

Hi Shane. Thanks for contacting us. Yes, these items are the same part. If you order from either you would receive the same item.

I bought imac retina 5k, 27-inch, 2017 with 16 gb (2x8) 2400 mhz ddr4 memory. i'm planning to add another 32gb (2x16). will this model work fine ?

Thank you for your question. Kit CT2K16G4S24AM is compatible with your iMac Retina 5K, 27-inch 2017 model. I will mention that depending on the version of your iMac you may not be able to exceed 32GB. 2017 models using the 3.4GHz i5 processor are limited to 32GB while the 3.5GHz and 3.8GHz models can reach 64GB.

Would someone please explain single and dual rank? Which one should we buy and will both work in our fancy new iMac 27 2017s?

The Crucial Community has an article...What is a memory rank. Wikipedia does too, look up memory rank. You can look at your Apple memory to see if it's single or dual ranked in case you want to strictly match the stock memory type. The Apple documentation mentions nothing about single or dual so it would appear that it doesn't matter. I purchased the dual ranked (16x2) and it is working just fine with the stock RAM (4x2).

Crucial 16gb 260 Pin Sodimm Ddr4 Pc4 19200

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Description

🚀 Upgrade your Mac’s memory game — because speed waits for no one!

PLUG AND PLAY UPGRADE - 260-pin SODIMM module for quick, hassle-free installation without downtime.
ENERGY EFFICIENT DESIGN - Low 1.2V voltage reduces power consumption, extending your Mac’s battery life.
SMOOTH SPEEDY WORKFLOW - 2400 MHz clock speed ensures fast data transfer and responsive computing.
TRUSTED DURABILITY COMPATIBILITY - Backed by Micron’s 40+ years of expertise and tailored for Mac systems.
BOOST YOUR MACS MULTITASKING POWER - 16GB DDR4 RAM designed for seamless performance in Intel-based Macs.

The Crucial 16GB DDR4 PC4-19200 SODIMM is a high-performance memory module operating at 2400 MHz with a 260-pin form factor, optimized for Intel-based Mac desktops and laptops. It offers a reliable, energy-efficient upgrade that enhances multitasking, speeds up demanding applications, and ensures seamless compatibility with Mac systems. Backed by decades of Micron’s memory expertise, this module delivers durability and easy installation for professionals seeking to maximize productivity.

Specifications

ASIN	B072K5HVRX
Additional Features	nv: Company Program^Crucial Apple \| Component Configuration^x8 based \| Configuration^2048Meg x 64 \| DDR Timings^CL=17 \| DIMM Type^Unbuffered \| Density^16GB \| Error Checking^NON-ECC \| Megabytes^16384 \| Memory Type^DDR4 PC4-19200 \| Module Rank^Dual Ranked \| Package^260-pin SODIMM \| Platform Category^DDR4 \| Speed^DDR4-2400 \| Voltage^1.2V
Best Sellers Rank	#619 in Computer Memory
Brand	Crucial
Built-In Media	DDR4 SODIMM 2400 Internal Memory For Mac
Column Address Strobe Latency	17
Compatible Devices	Desktop
Computer Memory Size	16 GB
Customer Reviews	4.5 out of 5 stars 364 Reviews
Data Transfer Rate	2400 megabits_per_second
Form Factor	SO-DIMM
Global Trade Identification Number	00649528783325
Item Type Name	Crucial 16GB Single DDR4 2400 MT/s (PC4-19200) DR x8 SODIMM 260-Pin for Mac - CT16G4S24AM
Item Weight	9.07 g
Manufacturer	Crucial Technology
Memory Form Factor	SODIMM
Memory Generation	DDR4
Memory Speed	2400 MHz
Mfr Part Number	CT16G4S24AM
Model Name	CT16G4S24AM
Model Number	CT16G4S24AM
Number of Items	1
Number of Pins	260
RAM Memory Technology	DDR4
RAM Size	16 GB
Special Feature	nv: Company Program^Crucial Apple \| Component Configuration^x8 based \| Configuration^2048Meg x 64 \| DDR Timings^CL=17 \| DIMM Type^Unbuffered \| Density^16GB \| Error Checking^NON-ECC \| Megabytes^16384 \| Memory Type^DDR4 PC4-19200 \| Module Rank^Dual Ranked \| Package^260-pin SODIMM \| Platform Category^DDR4 \| Speed^DDR4-2400 \| Voltage^1.2V Special Feature nv: Company Program^Crucial Apple \| Component Configuration^x8 based \| Configuration^2048Meg x 64 \| DDR Timings^CL=17 \| DIMM Type^Unbuffered \| Density^16GB \| Error Checking^NON-ECC \| Megabytes^16384 \| Memory Type^DDR4 PC4-19200 \| Module Rank^Dual Ranked \| Package^260-pin SODIMM \| Platform Category^DDR4 \| Speed^DDR4-2400 \| Voltage^1.2V See more
UPC	649528783325
Unit Count	1 Count
Voltage	12 volts
Warranty Description	Limited Lifetime

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