@andrewoliv82900 - I would just go upto 16GB of RAM
As you have a Fusion Drive you'll want to make a full backup and setup a bootable USB thumb drive with the macOS your system is running as you'll needed later.
Here you have both connectors which allows you to replace the almost useless drive Apple Blade SSD installed to something better! Here I would go with a 1TB SSD blade drive. Ideally, I would get a pin compatible drive from OWC. I still don't like seeing the M.2 adapters some use to use an M.2 SSD as they can iffy! I've seen the adapters fail as well as some SSD's which are just fine in a real M.2 case or PC system.
As to the order of things, after backing up you'll want to reformat both drives using the bootable OS installer thumb drive as the boot-up drive using Disk Utility. Now open it up carefully! Take the logic board out swap-out the SSD and re-assemble.
Using painters tape to hold the display on. Now with the USB thumb drive boot the system up. Now go into Disk Utility format the blade SSD and name it so you know it will be the boot drive. Launch the OS installer from the drive and setup the blade SSD as the boot drive.
Once you're running you'll want to restore you Apps to the SSD and put your media music and vids back onto the clean HDD as well as any older stuff. The blade SSD should only hold active projects and you want to leave 1/4 of the drive unused so the OS and your Apps has elbow room!
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@andrewoliv82900 - What does your system currently have for RAM?
Also open up Disk Utility, click on the icon in the left corner select the view for All Devices how many do you see? If you have a Fusion Drived system you should see two thats important! Let us know what you discover.
crwdns2934271:0crwdnd2934271:0 DanJ crwdne2934271:0
I have 2 memory slots, 4GB are currently installed, each accepts 2400 MHz DDR4. Disk Utility Findings: Fusion Drive - Container disk2 & Macintosh HD - Macintosh HD - Data. I want to open this thing up and upgrade as much as I can. What do you recommend upgrading to bring it to the best it can be?
crwdns2934271:0crwdnd2934271:0 Andrew Oliver crwdne2934271:0
Yes, you can keep the HDD for extra storage alongside the SSD. It’s definitely worth it for capacity and performance.
crwdns2934271:0crwdnd2934271:0 Rashmi Kandhil crwdne2934271:0