How do you access the RAM slots? From the picture on internal storage installation, I notice that in the middle there is a big black 2.5” hard drive mount. Do we need to remove it to access the RAM slots?
Yes you do.
Be sure you actually need the extra RAM – Danny’s estimate above is accurate. If you don’t need it it will literally be unused and wasted.
Here’s my NUC6i5 on Arch running my ~30K tracks collection (it rarely exceeds 1GB):
The magic of Linux/Unix
I admit I do not need 
as I have a similar library size as yours.
Currently I am running ROCK in an NUC 6i5 with 2x8GB RAM. The RAMs were cheaper then when I built it 2 years ago. I could hear the improvement when switching from running Roon Core in Windows 10 to ROCK when it was made available. But I always had this thought in my head that I probably could further improve the sound quality. Though 6i5 is quiet, it is not fan-less, any vibration when the fan kicks in will definitely degrade the sound reproduction. And correct me if I am wrong, I thought I read somewhere that the Roon OS in Nucleus+ is different from the free ROCK I am currently running in my NUC. With a fan-less Nucleus+ and its optimised Roon OS in Nucleus+, I could possibly extract a better sound quality from Roon.
My head and my heart are still debating if I should order a Nucleus+. If I do, I can just transfer the 2x8GB RAM (DDR4 2133 MHz) over from my NUC and future-proof the Nucleus+ for the foreseeable future.
OT but really? Where did you get this idea from? Roon uses RAAT which is bit perfect data transmission, end to end. How is a tiny amount of vibration supposed to influence this?
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@support Help, does anyone know if I can install 2 16GB 2666MHz sticks into my Nucleus+
Of course you can. It is a standard Intel NUC motherboard, I think they are using the 7th gen motherboard.
Something like this should work,
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Thanks for the info, just installed a pair of these:
Booted up and Roon was running after about 5 minutes
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Does the NUC need any BIOS config to recognise the new amount or is it just automatically detected?
Automatically detected
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Most every modern motherboard auto senses both ram and disk drives
Installed fully compatible memory 16GB, also replaced with a compatible faster M2 SSD 250GB. Result-increased speed, stability. 
Autoselection of all compatible components: 
how did you do that? did you clone the disk?
It’s simple. M2 was changed in the Roon, I just installed the memory.
So I am interested in cloning my Nucleus One SSD to a faster one - I have one around. Is there anything that makes this a bad idea?
Why? It’s unlikely to make much, if any, difference. After starting, the Roon Server is in RAM and the database is (mostly?) running from RAM as well.
Don’t see why no. Even if you don’t change the SSD now, at least you have a clone should the built-in SSD fail, which is known to happen on the nucleus and nucleus+.
(In case you’re wondering, I cloned mine and turns out I needed the copy as the SSD went bad.)
So, actually found that the cloning software was flagging that this would need mounting as it was a bootable Linux image. Decided my RAM upgrade is good enough for me. The 21 hour power outage we suffered as I was trying to work everything out meant my enthusiasm waned.
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I did a SSD upgrade and found it mad a huge difference when using Focus. Just my experience.
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