Apologies if this has been asked and answered before but did not find it…
Am I missing something?
ROCK is only officially supported and known to work on the NUC devices that are listed as supported.
On any other hardware, it may or may not work, and if it works then it’s still not officially supported.
It’s not about the CPU so much but about all the other hardware. E.g., NUCs have Intel chipsets for Ethernet, while other mini PCs may have chipsets from other manufacturers, and ROCK may or may not have working drivers for this.
Both Nucleus, and ROCK devices, which run on a Intel NUC, use Roon OS.
ROCK is described in the following help guide, and this lists compatible hardware.
It is highly unlikely that the Nucleus One uses an Intel Celeron.
I thought it was more or less confirmed that it does
Edit: only a guess It’s a Intel N100
The same as I have in my non official Roon Server
However, I don’t have USB audio support with Rock so use DietPi
As @Suedkiez says, with Rock, stick to a supported Nuc for full compatibility
Other options are hit and miss
Edit: To answer the OPs 1st question. No, the Nucleus One may have a Celeron chipset. I suspect though it’s a N100, formerly Alder-Lake
Hope this helps
Oh well, I must have missed that. I guess the documentation and recommendations need updating.
Thanks for answering that!
I do not need USB audio, so I guess something like the Beelink 12th Gen Intel Alder Lake-N100 Processor would work?
Sure about the N100? AFAIK this CPU has been introduced only in 2023 and Mini-PC motherboard sets have not been available from the start. Not saying that it is impossible but I would rather assume the period of extensive testing and constructing case, heat management and alike around a newly introduced board would have taken more time from roon´s side.
If I recall it correctly, in one of the first reviews of a unit provided by roonlabs it was specifically stated that Nucleus One is running a quad-core Celeron and there was no official statement that this was incorrect. Same to Hans Beekhuysen´s review who is speaking about Celeron specifically.
I don’t think Roon says anything about CPU or any hardware, just the library size that is suitable. Appliance and all that. But the review in the German mag mentioned it IIRC, though only that is a Celeron and not the specific model. (This was followed by much complaining in the N1 threads 
)
They have refused to say what cpu is in either of the new units so they can swap them out to what’s new at the time or in short supply to something with similar specs.
Assumptions have been made that by the shape of the motherboard and that some one looked inside and said it’s a Celeron cpu it’s likely to be something like the n100 in the Nucleus One, but until someone gives an official teardown it’s all rumours. The Celeron range have two distinct levels of cpu and the n100 is comparable if not better than 7/8 i series cpus and also have low TPD and heat dissipation which is essential for this unit and of course are much cheaper.
No, not a 100% sure 
It may be a Celeron N5105
Unless someone who owns a N1 is happy to remove the cooling fan so we can peak at the chipset, it’s only a guess.
For the original poster: I have run Rock on a J4105 Celeron mini pc (BMAX B2) and it worked just fine.
I did, however, migrate to an i5 6400 based Lenovo M900 initially because I thought it would handle some of the DSP more effectively but the reality is, a few months down the line, I can’t really tell the student l difference.
I’m looking to get a fanless N100 and try that for my Roon server on the next month.
What would be even better would be for Roon to pull their finger out and make the Nucleus One available in the UK/EU. I for one, would post the extra to have a supported product.
They are working on it…
Well you will be wrong.
A Celeron is exactly what the Nucleus One uses. Confirmed by the CEO.
I cant remember the chip model but its a capable quad core chip.
Please post a link to this comment. Some think it is an N100. Legacy Celeron is now discontinued since 2022, so I hope it’s not a Celeron.
I can’t recall anything official from Roon staff and AFAIK the model was not mentioned but it started here:
And the linked LowBeats review in German said:
Roon nennt den Server jetzt übrigens offiziell Server und nicht mehr „Core“. Im Nucleus One erledigt ein 4-Kern Celeron Prozessor von Intel die Rechenarbeiten und kann dabei auf 8 Gigabyte RAM und 86GB internen Speicher zugreifen. Das ist in etwa die Ausstattung, des QNAP HS-453DX, den LowBeats schon seit geraumer Zeit als Roon-Server Roon oder auch des schon älteren Intel NUC mit i5 Prozessors, den ich privat verwende. Das ist für den Betrieb einer Highend-Anlage selbst mit kniffeligsten Signalen und Raumkorrektur mit großen Reserve mehr als ausreichend.
Translation:
By the way, Roon now officially calls the server “server” and no longer “Core”. In the Nucleus One, a 4-core Celeron processor from Intel does the computing work and can access 8 gigabytes of RAM and 86GB of internal memory. This is approximately the same specs of the QNAP HS-453DX, which LowBeats has used for quite some time as a Roon server, or like the already-older Intel NUC with i5 processor that I use privately. This is more than sufficient for the operation of a high-end system even with the trickiest signals and room correction with a large reserve.
It wasn’t said in a chat. Eno said it in a video with a youtuber though I have no idea who at this point.
I have no reason to lie, it’s a Celeron. A modern one that is quad core. That’s all that was said.
No one said you were. In the same way, I never said it wasn’t a Celeron. Still, no definitive answer. And, if it is a Celeron, or an N100, Roon really needs to update their documented minimum requirements.
That would be a good idea as some modern Core i3, Atoms and Xeons as well as N100 and its derivates can all be pretty powerful and sufficient for roon.
Nobody said I wasn’t. So I did.
It wasnt a defensive comment, I was just highlighting my point.