Just for completeness, my comments from facebook since Pat moved the conversation over there earlier.
Thanks, Pat. Could you please post the same on HW Forum? Based on nanoreview's CPU comparisons, the i9-12000K has almost twice the capacity of the i9-7900X. The i9-13900K has almost three times the capacity. The gen 14 CPUs aren't really out in off-the-shelf PCs yet and haven't been benchmarked.
Francois is right. If there's a tuning mistake, like sysmain not disabled, you can have red on the CPU meter and possible glitches with any Windows PC.
As far as Nancy goes, I'd say your CPU might just barely handle 2 perspectives if all the Windows tuning steps are done and Hauptwerk is running as Admin in realtime priority. Any missed tuning steps and you'll see red. The i9-7900X is really not up to a modern processor.
It would make sense to go to an i9-13900K or i9-12900K commercial off-the-shelf PC from a reputable company if you also get Francois to tune it for you and check it after any Windows updates. Since computers aren't your hobby, I wouldn't suggest a gaming PC or self build for you even though you'd save money.
Your settings of 48k sample rate and 4 x 512 buffers shouldn't be a problem for CPU capacity. If anything I'd have said use 1 buffer of 1024, since 40 msec latency is perceptibly sluggish. But that will make red a little *more* likely on the CPU meter.
By the way, max polyphony can't be 48kHz -- that's your sample rate. What's your polyphony setting on Nancy? With Nancy loaded, go to View | Mini control panels | Polyphony and see the number set there. That's the polyphony limit.
To check your Windows tuning for audio, please read and use this download:
https://www.cantabilesoftware.com/glitchfree/You might decide to buy their software, but I haven't tried it myself.