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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Opties

Updated Upgrades for hard drives and CPU

Hi everyone,

I’ve read through questions and answers for these upgrades, but I feel that the responses are outdated and many people have had long term experiences and reliability I’d like to know of. Thanks in advance to any help.

I bought a used 2017 iMac 27” i5 with 40gb of RAM a month ago and need to upgrade my hard drive space and would really like to increase my read and write speeds. My 2012 Macbook Pro i7 with a 500gb hard drive is faster than my iMac. I currently have the 2TB hard drive and have about 250GB of space left. Most of my data is pictures and I need room for future storage as well, so I’d want a total of at least 4TB.

Should I upgrade either the SATA to a SSD 4TB (Samsung SSD 860 EVO 4TB) or increase my blade HD or both? I’ve seen that upgrading just the SATA to SSD seems to give very good read and write increases, but I’d prefer to do everything at once rather than reopen my iMac to do another upgrade. Another idea I had was to upgrade the SATA and put my Macbook Pro blade SSD in my iMac and upgrade my Macbook Pro blade SSD to a 1TB. I feel that I’d need a walkthrough on upgrading any blade SSD as I don’t have a PC and prefer not to purchase products for one time use to upgrade (such as an enclosure to prepare the blade SSD) unless the benefits are good.

I’m not really interested in upgrading my CPU as I feel 3.8GHz is plenty for me, unless someone has a good argument.

Again, thank you to everyone in advance for any help!

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Opties

To increase your drives speed you have the right idea of going with a SSD. The real question is are you willing to setup your system with two drives?

I would install a 500 GB or 1 TB blade SSD to gain the high speed I/O of the PCIe/NVMe connection (OWC Aura Pro X2) that will be your boot drive where you hold your OS and Apps leaving the rest empty! This space is used for your OS & apps for virtual RAM and caching. Depending on your apps it can also be used as a scratch space like image or video work. If you are not using these you can go with a smaller SSD. Keep in mind you want to reserve at least 1/4 of the drive.

The SATA drive interface is only 6.0 Gb/s so it has its limits! If you need something faster that will require an external Thunderbolt drive (RAID). You also have physical limitations as traditional HDD’s get slower as you go to larger sizes and they require more power and product more heat Seragate BarracudaPro 2TB ~ 14 TB or Western Digital Black 500 GB ~ 6 TB. While one could use a SSD instead between the cost factor and not likely needing high speed file access, as in the case of downloaded music or even family pictures.

Update (07/03/2020)

Did you get a Fusion Drive, a Fusion drive you indeed have two drives. The blade SSD is a small drive used to cache your SATA HDD. It is too small to be used as a boot drive. It really can't use used with a second SSD (replacing your HDD for a SSD) it won't offer any performance benefit. In addition, if you put in a larger SATA HDD the small blade SSD won't be as effective.

Setting up the larger blade SSD as I outlined will indeed leverage it fully for OS & App files, OS & Apps caching needs as well as the OS's need for virtual RAM.

The boot drive SSD does not need to be large. It just needs to be big enough for your OS and App files and offer enough empty space for virtual RAM & caching. Depending on your Apps they may leverage it as scratch space, as an example: video editing apps.

The size I recommend is a 500 GB for general use, 1 TB if you are doing video/music production or photo editing or CAD.

The size of the SATA drive is based on what your needs are. HDD's are cheaper than SSD's at larger sizes. Having a large quantity of stuff now and what you'll likely need. Most people don't need a SSD for they data drive. As an example I have a 27" iMac which has a 500 SSD, a 1 TB HDD and has a Thunderbolt2 RAID drive for my photo work which is very large images. My HDD is used for my music and writings and the SSD is my boot drive with my Apps.

The SATA ports I/O is 6.0 Gb/s a SSD can leverage more of the I/O channel than a HDD.

You can setup iTunes to use a different location going to Preferences > Advanced '‘‘iTunes Media folder location'‘‘ Here’s a good guide How to Move Your iTunes Library to an External Drive this also works with a dual drive setup as well.

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Thank you so much for taking the tome to answer my post @danj !

Isn’t my 2TB iMac already set up with two drives? By increasing the capacity of one or both, I was assuming I could “re-fuse” them.

Is the OS programmed to use only the NVMe for OS, app storage, and scratch space? I would only need about 100GB for my OS files and apps.

just to clarify, it sounds like you’re recommending that I upgrade the blade SSD (500GB seems sufficient, correct?) to get the faster “speed” I am enjoying on my MacBook Pro AND increase the capacity of the SATA HHD rather than invest in a higher capacity SSD as I won’t notice much of a speed increase, need at least a 4TB capacity, and will be more affordable.

While 6GB/s of the SATA SSD sounds nice, what’s the transfer speed of a HHD?

MacOS wouldn’t allow me to mark my Photos library as the main library when it’s stored on an external drive. Sadly, this would be important to me as I want to keep updating my iCloud library on my desktop.

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