what is the advantage of having a Roon core that's not on your computer?

I had to separate my ROON Server and client from 1 machine to ROON Core (a cheap and crap DELL server). The reason is because my client computer has a NVidia graphics card. Occasionally, when Windows does an update, they inadvertently update the NVidia drivers. This causes the CPU on my machine to go up and become noisy (a no no). The ROON client GUI is very GPU intensive so I had to solve this Windows upgrade issue by migrating to ROON Core or manually revert back to a particular Nvidia GPU driver. 

ROON Core migration is the most complex thing you can do with setting up ROON. I am software developer and know my way around. However, it maybe simpler for most folks to start from scratch if they also have this issue and need to go CORE.

This type of bug happens in both Windows and Macs. Go to the ROON forum and checkout the threads.

I love the CORE setup I have now. No more upgrade headaches. I also posted a few minutes ago on another thread how I get my music to my DAC with some pretty cool (and relatively cheap) noiseless fibre cables. That is the reason I can use  a cheapo computer for my CORE. 

I specifically didn’t want to rely on a computer (and have it on all the time) for my Roon Core, and so waited to get a server/streamer that could do it. I considered several, including Wyred4Sound and Innuos (one box solutions), but decided on the Small Green Computer sonictransporter and the microRendu. I keep the SGC box on my desk in the corner of the listening room (router is there) and have the tiny microRendu tucked away across the room on the hi-fi rack. It’s been excellent. Quiet, dedicated box for just Roon and storage of ripped files.

+1 on the SGC ST.  I moved my Roon Core off a iMAC to the ST inside the gear rack.  Simple dedicated box dedicated to running the core.  No more problems with the iMAC patches causing issues. 

Yes
Niether  Non audio hardware and software.
I have no idea

besides taxing the CPU of my mac and causing interruptions to the stream (which is very annoying) are there any notable improvements to the quality of the sound?  When you say the mac is introducing noise, what is that exactly?  Please excuse my ignorance.  I'm close to getting a NUC but I just want to know exactly what it's giving me over using my Mac as the core.  I leave my computer on 24/7 so that's not a problem

thanks