One last question about iMac RAM.

[rpbrownphoto]

Got a new 2019 27" 5k iMac on the way and I'm upgrading the ram myself.

Will this work? Amazon reviewers are saying yes, Micron CPG is saying no (it isn't verified).

Crucial 32GB Kit (16GBx2) DDR4 2666 MT/s (PC4-21300) DR x8 SODIMM 260-Pin Memory - CT2K16G4SFD8266

CT16G4SFD824A is a 16GB DDR4 Notebook module that operates at speeds up to 2400 MT/s and has a CL17 latency. It is an buffered SODIMM. It conforms to the industry standard DDR4 SODIMM layout of 260 pins and is compatible with systems that take DDR4 2400MT/s SODIMM memory.

www.amazon.com

It seems slightly different than what the Crucial site recommends which would be:

Crucial 32GB DDR4 2666 MHz SO-DIMM Memory Kit for Mac (2 x 16GB)

Buy Crucial 32GB DDR4 2666 MHz SO-DIMM Memory Kit for Mac (2 x 16GB) featuring 32GB Capacity (2 x 16GB), 2666 MHz Clock Speed, PC4-21300, SO-DIMM, 1.2V, CL19 Latency, Non-ECC, Unbuffered, Dual-Ranked, Compatible with Mac Systems, Lead & Halogen Free. Review Crucial null

www.bhphotovideo.com

I have Amazon credit which is why I ask..

and PC4-21300 is the same thing as PC4-21333 right?

 

[chscag]

Both will work okay. The Crucial kits that Amazon sells are essentially the same as from Crucial. I've used a Crucial Kit from Amazon to update the memory for my iMac and it worked great.

 

[rpbrownphoto]

Both will work okay. The Crucial kits that Amazon sells are essentially the same as from Crucial. I've used a Crucial Kit from Amazon to update the memory for my iMac and it worked great.

Great, thanks!!

 

[rpbrownphoto]

Well, of course, like everything else, this has turned into a hassle.

Got the iMac yesterday and immediately swapped out the 8GB of ram for 64GB of the aforementioned Crucial RAM from Amazon. Long story short the machine crashes every 10 seconds to a minute. It just reboots itself, I have access to the desktop for 30 seconds, then crashes again. I have Apple Care and was on the phone with a guy last night who confirmed that the RAM is certainly the culprit..

I took out the Crucial RAM and put back in the Apple RAM and the problem is gone. Of course now I have 8gb of RAM which renders this computer useless.

What RAM should I try next? Should I get Crucial ram again the the mac specific brand?

Or should I try the OWC stuff? The OWC2666DDR4S64S

OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz 260pin SO-DIMMs Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S)

4 x 16 GB (64GB) 2666MHZ DDR4 SO-DIMM PC4-21300 Memory UpgradeProduct Specs: Technology: DDR4 SO-DIMM 260 Pin Density: 4 x 16GB (16384MB) RoHS: Yes Pin Count: 260-pin Op. Temp.: 0C to +85C Data Rate: DDR4-2666 Speed: PC4-21300 Voltage: 1.2V Low Noise 8-Layer PCB Meets and/or Exceeds Apple/Intel S...

www.amazon.com

 

[BATman.Berlin]

Have you put them into the respective slots (1 and 3)? The specs for these modules look ok. Other than that I can only assume the module itself is defective. A checkup from recovery could reveal that

 

[rpbrownphoto]

I had to use all 4 modules as I had four sticks of 16. Returned that ram today and ordered the OWC 2019 iMac specific stuff. Since I got the Crucial from amazon, it very well could have been defective or some ****** low key knock off...

 

[CWallace]

Have you tried to isolate the bad DIMM by installing just one of them at a time and booting off it it? If that works, try installing two at a time and rotate through them to see if you can reproduce the error.

I've used Crucial RAM in multiple iMacs (including my current one) without issue, so it's likely either a defective DIMM outright or something causing the DIMM to fail when used in pairs or quads.

 

[rpbrownphoto]

That’s a good idea but I already sent it back. Getting pretty sick of flipping my iMac face down over and over and over again. Figured might as well just start fresh with something else instead of trying to return like one stick of ram out of the 4 or something.. hopefully it’s the ram and not the iMac itself because I’m gonna be bummed if I have to send it back.

 

[Phil77354]

The Crucial kits that Amazon sells are essentially the same as from Crucial.

I'm curious, even though you've already returned this RAM - when you purchased from Amazon, was the purchase from the Crucial store (sold by Amazon) or from another seller? Was the part number on the RAM exactly the same as what was specified on the Crucial website for this application?

 

[alisalem]

I'm using the ones from Amazon.

 

[rpbrownphoto]

The Crucial ram from Amazon was garbage. Made my iMac crash over and over and the OWC iMac specific ram works perfectly. Pretty damn fast with 64GB. I found out while purchasing said ram that the 2019 iMac's can even handle 128GB! I almost did that but then I realized how much of an unnecessary flex that is for someone like me who's just using PS and LR. Upgrading to this 3.7ghz iMac with 2TB of storage and 64gb of ram was such a wise investment. Retouching is actually enjoyable now. Hopefully there are actually jobs available once this pandemic is cleared up (if ever?)

I have a bit or neurosis so please tell me I'm tripping: Having that crucial ram in my machine for a couple hours when setting this iMac up wouldn't do any permanent damage to the computer, right? My luck is laughably terrible so I worry about that. It's fine, right? Computer runs perfectly now but it's always in the back of my mind.

I hate that I had to lay this brand new iMac face down on a towel 3 times and keep propping open the ram gate, but the towel was clean and I don't see any scratches. I should be totally fine, yeah?

Another funny thing: the ram from Amazon was clearly defective because there were numerous reviews saying it worked for others just fine. I think the ram in the packaging must've been different from what was advertised. I sent it back and was accused by Amazon (in a roundabout way) of hustling them leading me to believe I'm right, it wasn't the ram that I purchased.

 

[mindquest]

I had to use all 4 modules as I had four sticks of 16. Returned that ram today and ordered the OWC 2019 iMac specific stuff. Since I got the Crucial from amazon, it very well could have been defective or some ****** low key knock off...

You can never go wrong ordering OWC ram!! Their customer support is A+. Had. them swap out some bad ram after 6 years of use no questions asked.

 

[easy4lif]

Personally I’ve never had a bad batch of crucial ram sticks but I’m glad u bought OWC. Good to support a Mac focused company

 

[Phil77354]

The Crucial ram from Amazon was garbage.

Did you see my earlier comment, asking if the Crucial RAM was purchased from Crucial itself on Amazon, or another third party seller. Your invoice from Amazon will tell you this. This can make a difference in ensuring that what you receive is the right stuff.

 

[rpbrownphoto]

I'm glad I went with OWC! The ram was sold and fulfilled by Amazon, so something must have been off. Shouldn't be any long term damage or anything from having the wrong ram in the computer for a couple hours or less, right?

 

[easy4lif]

I'm glad I went with OWC! The ram was sold and fulfilled by Amazon, so something must have been off. Shouldn't be any long term damage or anything from having the wrong ram in the computer for a couple hours or less, right?

No

 

[alisalem]

The Crucial ram from Amazon was garbage. Made my iMac crash over and over and the OWC iMac specific ram works perfectly. Pretty damn fast with 64GB. I found out while purchasing said ram that the 2019 iMac's can even handle 128GB! I almost did that but then I realized how much of an unnecessary flex that is for someone like me who's just using PS and LR. Upgrading to this 3.7ghz iMac with 2TB of storage and 64gb of ram was such a wise investment. Retouching is actually enjoyable now. Hopefully there are actually jobs available once this pandemic is cleared up (if ever?)

I have a bit or neurosis so please tell me I'm tripping: Having that crucial ram in my machine for a couple hours when setting this iMac up wouldn't do any permanent damage to the computer, right? My luck is laughably terrible so I worry about that. It's fine, right? Computer runs perfectly now but it's always in the back of my mind.

I hate that I had to lay this brand new iMac face down on a towel 3 times and keep propping open the ram gate, but the towel was clean and I don't see any scratches. I should be totally fine, yeah?

Another funny thing: the ram from Amazon was clearly defective because there were numerous reviews saying it worked for others just fine. I think the ram in the packaging must've been different from what was advertised. I sent it back and was accused by Amazon (in a roundabout way) of hustling them leading me to believe I'm right, it wasn't the ram that I purchased.

Not sure what happened in your case but I've been using the ones from Amazon with zero problems. I've paired mine with the 16GB I got from Apple for a total of 40GB.