|Item Height||1.1 inches|
|Item Width||0.2 inches|
|Computer Memory Type||DDR4 SDRAM|
|Maximum Memory Supported||16 GB|
|Memory Clock Speed||2400 MHz|
|Are Batteries Included||No|
|Item model number||CT16G4S24AM|
|Product Dimensions||6.86 x 0.51 x 2.79 cm; 9.07 Grams|
Crucial CT16G4S24AM DDR4 2400MHz SO-DIMM 260-pin Memory for Mac Module, 16GB Dual Rank
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CT16G4S24AM is a 16GB Dual Ranked DDR4 SODIMM module that operates at speeds up to 2400 MT/s and has a CL17 latency. It is an Un-buffered SODIMM. It conforms to the industry standard DDR4 SODIMM layout of 260 pins and is only compatible with 3.5GHz model systems that take DDR4 2400MT/s SODIMM memory.
1x Crucial 16GB DDR4 2400MHz SO-DIMM 260-pin Memory for Mac Module CT16G4S24AM
Compatible with Mac systems
Take the guesswork out of upgrading your Mac with Crucial memory for Mac systems. Since Apple computers often have very specific memory requirements, including particular component densities, speeds, and SPD programming specifications, it’s important to use memory that’s engineered for your Mac. With more than a decade of experience manufacturing and developing memory for all types of Apple computers, Crucial makes adding memory the easiest way to upgrade your Mac.
Reliability for Mac systems
When you use your Mac system, you expect intuitive, dependable performance. Expect the same out of your memory. Every Crucial module that leaves our doors has been extensively tested at the component level for voltage and temperature resistances, signal integrity, and software compatibility.
Speed for Mac systems
A memory upgrade is the fastest, easiest, and most affordable way to get more performance out of your Mac system. Upgrade your Mac with Crucial memory modules and maximize your creativity with top speed and high density DDR3 and DDR4 memory modules.
Support for Mac systems
Unsure how to install memory or have an important question about your Mac system? Let the Crucial experts help! They know Apple systems inside and out and enjoy providing helpful, friendly technical support. Whether it's phone support, videos, FAQ articles, or do-it-yourself install guides for more than 70 different Mac systems, Crucial has the resources you need to keep your system up to speed.
Micron quality – A higher level of reliability
As a brand of Micron, one of the largest memory manufacturers in the world, Crucial memory for Mac systems is backed by the same quality and innovation that has produced some of the world’s most advanced memory and storage technologies. With a product portfolio that includes upgrades for more than 100,000 systems, we’ve got one specifically designed for your Mac system.
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iMac 2019 27inch 5k Retina Model - existing base capacity 8GB; increased to 24GB.
You can mix modules, you have to buy a kit or twin modules to fill in the two remaining slots.
Gen. rule of thumb about RAM - buy in pairs and always fill in all available slots. 2 slots should remain free, never none or odd numbers i.e. 1/3.
If you want to optimise you always put RAM with the highest capacity in the bottom (Bank 0) and 3rd (Bank 2) from the bottom. Then the original RAM modules swap to the new positions of slot 2 (Bank 1) and 4 (Bank 3).
Where my pre-installed 2 NR 4GB modules were I swapped with the NEW 2 NR 8GB modules. And then put the already pre-installed 2 NR 4GB modules in the 2 remaining slots.
Firstly, this was put into the NEW 2019 iMac as above. I can confirm it works perfectly, no issues.
PLEASE NOTE: I made a mistake in purchasing only one of these as I thought they came in pairs. That's my fault but they offer these in pairs slightly cheaper, but no big deal. They must be in pairs! I just didn't read it properly.
Anyway, once I had both they are very easy to install (5 mins) and a reboot and you're off! I placed the new pair in the empty slots and left the original RAM from Apple (X2 4GB sticks) in the original slots they came in. So simple, and I now have 24GB RAM for less then £90. Speeds things up and will be future proof for some time now. Highly recommended.
I purchased a single 8gb stick and this I beleive is where I went wrong. I followed Apple's instructions and placed the stick in the bottom 4th slot, powered on and nothing, I then tried the 2nd slot and again nothing happened. Without the module installed my iMac rebooted.
Turns out that despite what some reviewers have implied, you cannot mix 4gb x2 with an 8gb module. I have checked forums and have seen other users saying the same and also indicating that it could be that the iMac is being a bit fussy!
Sadly I have returned my purchase for a refund, the only option now is to buy 2x4gb or 4x4gb or 2x 8gb or 1x16gb and replace the apple sodimm modules.