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.
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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