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).

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RAM 64GB Kit (2x32GB) DDR4 2666MHz CL19 Memory for Mac CT2K32G4S266M

Product ID: 228368110

Details

Brand
Crucial
Compatible Devices
Desktop
Computer Memory Size
64 GB
Memory Speed
2666 MHz
RAM Memory Technology
SO-DIMM

⚡2666 MHz blazing speed

💾64GB massive capacity

🔧Plug & play easy install

595553CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Upgrade your Mac’s memory game — because speed and space wait for no one!

MASSIVE 64 GB CAPACITY - Handle intensive workflows and memory-hungry apps effortlessly with 2x32GB modules.
BLAZING 2666 M HZ SPEED - Turbocharge your Mac’s multitasking and app responsiveness with DDR4 2666 MT/s performance.
EFFORTLESS INSTALLATION - No tech skills needed—upgrade your system in minutes with guided how-to support.
MICRON BACKED RELIABILITY - Built on 42 years of memory expertise with rigorous testing for rock-solid stability.
SEAMLESS MAC COMPATIBILITY - Optimized for Mac systems with 260-pin SO-DIMM form factor and Crucial’s compatibility assurance tools.

The Crucial 64GB DDR4 2666MHz Kit (2x32GB) is a high-performance SO-DIMM memory upgrade designed specifically for Macs. Featuring a fast 2666 MT/s speed, CL19 latency, and a 260-pin form factor, it delivers massive capacity and reliable performance backed by Micron’s 42 years of expertise. Easy to install with compatibility tools and how-to guides, this kit ensures your Mac runs faster, smoother, and ready for demanding multitasking.

Specifications

ASIN	B08DP8CPXF
Additional Features	DDR4, Non-ECC
Best Sellers Rank	#254 in Computer Memory
Brand	Crucial
Column Address Strobe Latency	CL19
Compatible Devices	Desktop
Computer Memory Size	64 GB
Customer Reviews	4.6 out of 5 stars 394 Reviews
Data Transfer Rate	12 Gigabits Per Second
Form Factor	SO-DIMM
Item Weight	8 Grams
Manufacturer	Crucial
Memory Form Factor	SODIMM
Memory Generation	DDR4
Memory Speed	2666 MHz
Mfr Part Number	CT2K32G4S266M
Model Name	Crucial DDR4 2666 MT/s SODIMMS
Model Number	CT2K32G4S266M
Number of Pins	260
RAM Memory Technology	SO-DIMM
RAM Size	64 GB
Special Feature	DDR4 , Non-ECC
UPC	649528903402
Unit Count	1.0 Count
Voltage	1.2 Volts

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