Upgrading a Mac Mini (late 2014) to a combo SSD + HDD

[Spigaw]

Hey there people!

I couldn’t find a definitive answer anywhere, so here I am with hope.

I recently bought a Mac Mini (late 2014), with these characteristics. I want to upgrade it to a combo SSD + HDD because you know why, but I can't find a way to know if it is possible or not to add a second SATA connector (like some you can find really cheap on Amazon), or if it comes with a PCI connector (like it seems to be the case, via iFixIt).

So i wonder what's the best solution:

1. Buying a standard SATA SSD and replace the HDD with it
2. Buying a standard SATA SSD as well as a kit with two SATA connectors and keep both in the Mac
3. Buy a NVME SSD and plug it in the elusive PCI port.

Thanks in advance for your help!

 

[Fishrrman]

NO.
You DO NOT WANT to "upgrade" to a "combined" HDD and SSD, if by "combined" you mean "fusion".

First off, what kind of drive is inside right now, and what size is it?
How much RAM is installed?

If the drive inside now is a platter-based hard drive, it might be possible to add an SSD "blade-type" drive. There are numerous threads here on how to do this, you have some reading and researching to do.

It's actually easier to buy a USB3 SSD, plug that into a USB3 port, and use it as an "external" boot SSD.