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iMac (Retina 5K, 27-inch, 2017) CPU and NVME SSD Upgrade Pitfalls and Tips

JuliusKivi

macrumors newbie
Jan 22, 2020
3
0
Hey everybody.

I just upgraded my 5K Imac 2017 processor from I5 to I7-7700K, at the same time I switched my original PCI-E SSD to a CORSAIRMP510.

About a year ago, I switched the original HDD to a OWC 1TB Mercury SSD, I cloned it and everything went well.

But now when I did this Upgrade, Mac doesn't find my mercury SSD. It finds my processor and Corsairmp510 but not the mercury, where I installed everything. I had to install ne Mojave to Corsair (which is nice :)) but how can I get the mercury back??

I can find Mercury in system preferences but still there is no way, how to get in to it, does anyone know, what the problem is?

Sorry my English bad, Im from Finland :)

If anyone can help, please, let me know :)

Thanks, julius
 

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JuliusKivi

macrumors newbie
Jan 22, 2020
3
0
Its greyed out like in the picture and seems to be unmounted, any idea anyone?
 

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JuliusKivi

macrumors newbie
Jan 22, 2020
3
0
Okey, this turned into a monolog :)

I put back The original NVMe SSD and everything worked as normal, then I made time machine back up and another backUp :)

then took out The original NVMe SSD and put back The Corsair mp510 and used time machine backup to install my files and IOS to new corsairmp510.

after that i formatted The sata SSD and boom, its back mounted again ??

so for anyone who is doing this, if you have your files and IOS installed on sata SSD and you just switch The NVMe to new one, it cant read your files from sata SSD.

speeds with corsairmp510 is about 2,9w / 2.9r.

and I have s delidded i7-7700k so there are no temp problems.

everything was quite easy afterall, i have done this now for three times :)

important thing is to make shure that The processor is in socket, i had try to put The heatsink on about three times, before i was shure that it was really in place ->
 

KenStol

macrumors newbie
Jan 29, 2020
3
0
Hope folks still look at this thread!

I'm looking for a 'sanity check' on upgrading my 2017 5k 4.2GHz i7, 64GB iMac. Specifically replacing the NVMe with a 970 EVO 2TB, and 2 4TB SSDs in a 3.5 RAID enclosure. Haven't heard of anyone actually doing the 3.5 RAID and wondering if it would be a viable option. I previously have upgraded my rotational HD to a 10TB Fusion drive.
Info that I'd really appreciate would be whether this makes any sense in the first place, and also the choice of 4TB SSDs to put into the enclosure. the 2 drives I have looked at are both Samsung; the SSD 860 EVO and the 860 PRO, just wondering if the almost doubled price of the PRO is justified.

Thanks for all the previous posts, I'm a little late to the party, but looking forward to any advice or additional tips.

Ken
 

rustyhalo93

macrumors newbie
Nov 2, 2016
4
2
Hope folks still look at this thread!

I'm looking for a 'sanity check' on upgrading my 2017 5k 4.2GHz i7, 64GB iMac. Specifically replacing the NVMe with a 970 EVO 2TB, and 2 4TB SSDs in a 3.5 RAID enclosure. Haven't heard of anyone actually doing the 3.5 RAID and wondering if it would be a viable option. I previously have upgraded my rotational HD to a 10TB Fusion drive.
Info that I'd really appreciate would be whether this makes any sense in the first place, and also the choice of 4TB SSDs to put into the enclosure. the 2 drives I have looked at are both Samsung; the SSD 860 EVO and the 860 PRO, just wondering if the almost doubled price of the PRO is justified.

Thanks for all the previous posts, I'm a little late to the party, but looking forward to any advice or additional tips.

Ken

Hello Ken,

A little bit more information would be great, do you want to RAID 0 two 4TB SSDs? Are you planning on making a fusion drive with the RAIDed SSD and NVMe drive after the upgrade?
 

KenStol

macrumors newbie
Jan 29, 2020
3
0
Hi, I would like to RAID 0 the SSDs and make a Fusion drive of all 3. I’d really like to have a SSD version of what I have now; a 10TB mechanical drive with the original NVMe. Thanks
 

rustyhalo93

macrumors newbie
Nov 2, 2016
4
2
Hi, I would like to RAID 0 the SSDs and make a Fusion drive of all 3. I’d really like to have a SSD version of what I have now; a 10TB mechanical drive with the original NVMe. Thanks

Hello Ken,

I think this setup will be very risky as you are adding the RAID0 failure rate to the Fusion Drive partition failing rate together, and the gain of the speed (if there is any) doesn’t really worth the risk.

The sata SSD itself should be pretty close to the SATA3 port speed limit, the RAID0 of two SSDs will be bottlenecked severely by the SATA3 speed, plus the RAID0 is very risky as you will lose all your data when one of the drive fails.

On top of this, bundling NVMe Drive with the SATA0 setup means the entire storage bundle will be destroyed if one of the SATA SSD fails, and the speed of the fusion drive will not be faster than your NVMe drive speed, it will certainly be faster than your current spinning disk setup, but the speed gain you get here comes from HDD to SSD, a bit from RAID0 SSDs but not too much, and it will be much riskier than your current setup.

I would put my macOS volume just on NVMe SSD, and keep the SATA drives in a separate volume as data drives, I would recommend you go with single SSD without RAID for that volume.

Best
 
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Cyberherby

macrumors newbie
Feb 23, 2020
1
0
Germany
Hi folks,

I'm new here - please don't be annoyed if I come up with recurrent questions... :)
I landed here via Google when I was looking for informations about upgrading my 2017 iMac (i5-7600 and the 2 TB fusion drive).
After reading this thread my head is about to blow! I never opened an iMac before, but I am confident - usually I know where to put my screwdrivers on PCs, MacBooks, iPhones... ;)
I want to upgrade the CPU to an i7-7700k and replace the NVMe SSD and the HDD with another 2 TB SSD.

It seems that the highly recommended Samsung 970 EVO is no longer available with 2 TB (at least not with a reasonable price tag).
Is there a list / a posting with compatible and easy-to-usw NVMe-SSDs for the upgrade in the 2017 iMac?
 

Daniel Marchant

macrumors newbie
Jan 17, 2020
5
1
Today i installed OSX High Sierra (That is my pipeline version) on a Samsung 970 PRO Nvme disk 512gb, on my 27" 2017 Imac, and apart from taking ridiculously little time to do so, seems to be working fine.

The disk is not plug and play for OSX, so you wont be able to see it on recovery mode. I had to boot windows (from an external drive installation) and then the system was able to see the disk and even format it, so probably you just need to stick it in to a windows machine and format it before you drill you way in the Imac.

Another little tip, my system was originally 256 gb blade only, and when i opened it up it has the 3,5 drive brackets included, BUT NOT the sata cable which i found on Aliexpress for about 10 aud, and still waiting to receive, probably will update when i get it.
 

transattic

macrumors newbie
Sep 25, 2007
3
1
Hey Guys,

Anyone know if PCI-E Gen 4 m.2 blade SSDs like the Firecuda 520, Sabrant Rocket 4, and Gigabyte AORUS are compatible with iMac 2019 models?

Has anyone had successful builds with Gen 4's getting max speeds or anything greater than the Samsung Evo 970?
 
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DunDrent

macrumors newbie
Jan 20, 2020
3
2
Just for those interested, I have a working 2019 5K with CPU swapped from 3.0Ghz 6-core to 3.7Ghz 6-core(9th gen), 32GB RAM and 1TB SSD NVME Samsung Evo Plus. Had some issues with the 2/4 lanes us for a while but that's gone after swapping the adapter and checking the firmware of the Samsung(as explained earlier in this thread). SSD Write: 2770, Read: 3030.
 
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Kaida

macrumors 6502
May 28, 2016
275
107
Singapore
i noticed that for my non-sintech adapter, the nvme is shown in the "Option" key boot menu as the yellow/orange USB device. is this normal? Does Sintech adapter show it as disk drive or usb disk?
 

uBetchya

macrumors newbie
Aug 16, 2016
19
4
Hello everyone!

I'm considering on undergoing this upgrade on a 2017 27" iMac. I want to upgrade the NVME drive to a Samsung Evo Plus, but I don't want to upgrade the hard drive at all. In fact, I'm considering just leaving the hard drive out completely so that it runs completely off of the Evo Plus. The hard drive currently installed appears to be failing, and I don't want to purchase a second hard drive just to occupy that space, when it is not needed for my configuration.

My question here is, would this be a possible solution? Does the iMac (originally configured as a Fusion Drive) require that a SATA hard drive be connected to the system? Would this mess with the thermals in a way that causes the fan to constantly spin?

Lastly, if I do decide to keep the SATA hard drive installed, is it possible to still use this drive as a slave to store additional files?
 

medisaboy1

macrumors newbie
Apr 22, 2020
6
0
Hi guys after replacing the HDD my microphone stopped working. I checked the connection and it is good. Any ideas ?
 

CoolerT

macrumors newbie
Aug 13, 2020
1
0
Hi sebastienc,

Thank you for your detailed recording of your own adventure, your post really really helped me on my Late 2015 iMac 27 NVME SSD and CPU upgrade, the last two days was an ordeal for me, and I am so happy to be able to pull it off and write to you on my upgraded iMac!

So you are very accurate on the diagnostic LED behavior, I also experienced two type of diagnostic LED behavior: 1. only LED 1 is on when plugged in, no response when power button is pressed, diagnostic port on motherboard didn't read 12V input from terminal 1 (GND) and terminal 11 (power on signal).
2. LED 1 and 2 went on when plugged in even without power button press, then LED 2 went off for a brief second, went on again and the fan starts to spinning like crazy.

These, like you said, are all related to CPU not properly seated, and that metal bracket really is making everything 10x more difficult. The tension is too high and we risk bending CPU PCB. Also, when applying screws on the metal brakes, the cooler may be lifted up a bit, taking CPU with it cause of the thermal paste, and then if we keep applying the pressure, we will risk bending the pin on the motherboard.

Thank you again for your post.
Hello, Do you have any problems with sleep mode? My computer shuts down, once it stays idle for 10 minutes.
I have an iMac 5K Late 15, installed i7 6700k and 2T Samsung 970 Evo Plus. I use this computer for work and it is no go to have it shutting down every time! :(

I dont know what to do, seems like I have to open it again and put back 1Tb Fusion Drive and not to brake anything during this procedure.

I had hakintosh 5 years ago, it was a pain in the ass, i switched to iMac and was happy all this time, now I again have hakintosh like situation, and I invested to this upgrade nearly 700 euro, crazy.

To all, who thinks to upgrade your iMacs, think 10 times. I would buy just a new one instead of wasting half of the day, got a lot of stress and now have unstable machine!
 

oKUtItyp

macrumors newbie
Apr 30, 2019
5
0
Anyone who upgraded to 7700k have real-world experience on the temperature? I read somewhere that it's too hot for iMac 27" 2017
 

macuser04

macrumors newbie
Nov 14, 2020
1
1
Huge thank you to OP and all who have contributed here. Just upgraded my 2017 iMac to 1TB 970 Evo Plus NVME, 2TB Sata SSD, and i7-7700 (non-K). No issues, everything works great. Couldn't have done it without this tremendously detailed info :)
 
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tommygunz747

macrumors newbie
Nov 17, 2020
1
0

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