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Crucial "CT16G4SFD824A" Compatible to iMac?

SirApple

SirApple

macrumors member
Original poster
Nov 8, 2017
30
3
Hi everyone,

this might be a stupid question but I got 2 x 16gb of ram as a gift to my 2017 3.8 Ghz iMac but I am afraid that they might not be compatible.

They do not have the same number as the one I see on Crucials website.
The number the I have on mine: CT16G4SFD824A
The number I see on the ones that Crucial recommends for my computer is: CT10559861

They are both DDR4-2400 SODIMM, 1.2V CL17.

Will these work on my computer or not?

Any help is appreciated :)
 
I understand that. But if a company chooses to exhaustively test a specific part number with iMacs and then recommends that part number for iMacs, that is legitimate, especially if they are not charging a premium for that part, which they're not. Not everything is a sham or conspiracy.
 
Last edited:
SirApple said:
Hi everyone,

this might be a stupid question but I got 2 x 16gb of ram as a gift to my 2017 3.8 Ghz iMac but I am afraid that they might not be compatible.

They do not have the same number as the one I see on Crucials website.
The number the I have on mine: CT16G4SFD824A
The number I see on the ones that Crucial recommends for my computer is: CT10559861

They are both DDR4-2400 SODIMM, 1.2V CL17.

Will these work on my computer or not?

Any help is appreciated :)
Click to expand...

If you put it into your iMac and if your iMac doesn't go "beep beep beep", then the memory is compatible.
 
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SirApple said:
Hi everyone,

this might be a stupid question but I got 2 x 16gb of ram as a gift to my 2017 3.8 Ghz iMac but I am afraid that they might not be compatible.

They do not have the same number as the one I see on Crucials website.
The number the I have on mine: CT16G4SFD824A
The number I see on the ones that Crucial recommends for my computer is: CT10559861

They are both DDR4-2400 SODIMM, 1.2V CL17.

Will these work on my computer or not?

Any help is appreciated :)
Click to expand...
Just ordered this kit for my 2017 iMac. Based on Amazon reviews they work fine.
 
_Refurbished_ said:
Just ordered this kit for my 2017 iMac. Based on Amazon reviews they work fine.
Click to expand...

Thanks for sharing :)

I just read those reviews but some people says it works totally fine and some says that it made their iMac not to boot. So I'm considering just ordering the ones crucial suggest on their site to reduce the risk.
 
SirApple said:
Thanks for sharing :)

I just read those reviews but some people says it works totally fine and some says that it made their iMac not to boot. So I'm considering just ordering the ones crucial suggest on their site to reduce the risk.
Click to expand...
90% of reviews are 5 stars. Pretty sure those people got bad sticks. About as high of a review listing for memory. Either will work, most people report that the sticks work fine. These were the cheapest good sticks I could find.
 
Last edited:
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I've used Crucial/Micron RAM for years, and I've recommended it to others. Never had a problem, although for Mac systems I've always recommended that RAM that Crucial tested with the Mac and recommended for Macs.
 
mreg376 said:
I've used Crucial/Micron RAM for years, and I've recommended it to others. Never had a problem, although for Mac systems I've always recommended that RAM that Crucial tested with the Mac and recommended for Macs.
Click to expand...

So would you say that it is safe to use the RAM that I got or should I replace it?
 
They sound fine. They seem to meet the specs so you should be good to go. And it won't break anything if they aren't. If you want to feel more comfortable give Crucial a call. They're pretty good experts on Mac memory and their products.
 
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SirApple said:
So would you say that it is safe to use the RAM that I got or should I replace it?
Click to expand...
Crucial support lists them as compatible but untested. If they don’t work they’re being returned. If they work, they work :).

Installing them on Monday when my iMac arrives.
 
SirApple said:
Thank you all for sharing your thoughts, I will install them tonight
Click to expand...
If you get a black screen on the first try don't panic, just pull the memory and swap the slots with the factory memory and try again. I'm using Apple memory pulled from another machine for now and had to do the same swapping to get past the black screen at first. It seems to be a quirk with these at times.
 
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I added the two sticks today and so far everything works excellent :)

Thanks again for helping me :)
 
SirApple said:
Hi everyone,

this might be a stupid question but I got 2 x 16gb of ram as a gift to my 2017 3.8 Ghz iMac but I am afraid that they might not be compatible.

They do not have the same number as the one I see on Crucials website.
The number the I have on mine: CT16G4SFD824A
The number I see on the ones that Crucial recommends for my computer is: CT10559861

They are both DDR4-2400 SODIMM, 1.2V CL17.

Will these work on my computer or not?

Any help is appreciated :)
Click to expand...

Thank you for raising this doubt that you shared with great uncertainty after buying two Crucial Kit CT2K16G4SFD824A, effectively works perfectly. I had previously called the manufacturer and they disapproved of its use in my iMac 27 "5K 2017.
Your experience has been very useful, thanks for sharing.
Greetings.
 
Is it safe to mix and match ram? I currently have 16GB ram (2 x 8GB) that came with my iMac 2017 27" (custom ordered through apple.com) and plan to get 32GB Ram by Crucial. 48GB would be the total once I do get the ram. Not sure what apple uses for their RAM.
 
I've mentioned this before in these forums but the "For Mac" labeling by Crucial is irrelevant. The only difference (aside from a higher price) is probably the fact that it is Halogen free per Apple's environmental standards.

I've been using Crucial Ballistix RAM in my 2017 iMac for almost two years now with zero issues. On Crucial's site it is marked as incompatible with the 2017 iMac in giant red letters.

"For iMac" or not, you are extremely unlikely to have any problems at all.
[doublepost=1553572748][/doublepost]
gsmornot said:
If you get a black screen on the first try don't panic, just pull the memory and swap the slots with the factory memory and try again. I'm using Apple memory pulled from another machine for now and had to do the same swapping to get past the black screen at first. It seems to be a quirk with these at times.
Click to expand...

Please note that on first boot with a new RAM configuration the iMac will take up to one minute with a black screen as it initializes.

From Apple's RAM installation page:

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.
 
I agree with Sasasushi, these memory modules work correctly. This morning I received a new mail from Crucial confirming the incompatibility with mac, however I have them installed next to the two original modules and they work. The strange thing is that the specifics of the module recommended by them and these are exactly the same in both models.
I just ran a complete memory test and all the tests were passed confirming once again the compatibility.
 

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SaSaSushi said:
I've mentioned this before in these forums but the "For Mac" labeling by Crucial is irrelevant. The only difference (aside from a higher price) is probably the fact that it is Halogen free per Apple's environmental standards.

I've been using Crucial Ballistix RAM in my 2017 iMac for almost two years now with zero issues. On Crucial's site it is marked as incompatible with the 2017 iMac in giant red letters.

"For iMac" or not, you are extremely unlikely to have any problems at all.
[doublepost=1553572748][/doublepost]

Please note that on first boot with a new RAM configuration the iMac will take up to one minute with a black screen as it initializes.

From Apple's RAM installation page:

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.
Click to expand...

Withing the Crucial Ballistix, which one have you been using if I may ask?

Also, if instead of installing 2x16 GB modefules to go to 40, I Install 2x8GB modules to go to 24, will this be ablle to fully utilize the dual channel in the same way?
 
kaintxu said:
Withing the Crucial Ballistix, which one have you been using if I may ask?
Click to expand...

I'm using the 2400 MT/s version of these modules on my 2017 iMac but you would want to go with the PC4-21300 for the 2019 iMac.

Also, if instead of installing 2x16 GB modefules to go to 40, I Install 2x8GB modules to go to 24, will this be ablle to fully utilize the dual channel in the same way?
Click to expand...

Yes, that would be no problem at all. So long as the modules are matching, dual channel mode is enabled.
 
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