JMSOG

I don't remember exactly, but my GPU load is regularly sub-60%. VRChat on my current rig is *absolutely* CPU bound.
 
Trust me here: I am beyond certain that my current rig, in the case of *specifically* vrchat, my CPU is the bottleneck. 100%, absolutely no room for nuance. VRChat is weird man, lol.

Question is, how much GPU load do you see? If the GPU is already at 100% load, then reducing the CPU time isn't going to help, since you're GPU bound regardless.

Yes, you will be fine with just 8 cores. The 7950X3D is a pretty niche chip, since it only really makes sense for a work by day, gamer by night build. If you don't do real work on your computer (and by that I mean CAD rendering, video editing, program compiles, etc., not writing up word documents or similar) the 7950X3D is actively worse than the 7800X3D as the core parking algorithm is clunky at best. In games (assuming the core parking is working correctly), they will perform identically as the 7950X3D only has vCache on one of the CCDs and the other CCD will be effectively disabled, and their boost clocks are within margin of error of each other. Games almost never use more than 8 cores, and when they do it's only minor uses of them. 
 
If you only occasionally edit a video, the 7800X3D is still plenty fast, similar to a theoretical 10 core Ryzen 5850X in multi core performance. Sure, the 5950X is faster, but if you aren't actually doing that most of the time there isn't much of a point to it. 
 
 
The 5800X3D is still a solid choice for your system, though seeing as how the pricing for it is fairly high now (almost the exact same price as the 7800X3D) unless you find it used it makes more sense to just go to AM5 instead. 

7950x3D is not really ever worth considering with the amount of issues people have had with it. If you want a gaming cpu, 7800x3D is more then enough. By the end of AM5 you can always upgrade to the last X3D cpu that is released and be fine for the next few years after.
 
 
The other thing is, are you having issues IN VR chat to make this jump needed? It seems like it runs well enough on the hardware you are currently on. If all you do is VR chat i dont know if it is "worth" it. 

How do you know, i.e. how did you determine that? Are you sure the CPU is the limiting factor and not e.g. the GPU or network bandwidth?

The switch in both the router and dedicated switch you have yet to buy are both 1gig. There will be no difference.

Are you worried about the extra time it takes for signal to traverse an extra 25ft? That is negligible.
Ideally, there should be no switch as that is an extra point of failure that you don't need. It's not really doing anything that your AllInOne(router) isn't already doing. And you have to power a redundant device...
But having switch will let you hook up another device, say a NAS or laptop if you need it. So the choice is really about having an extra switchport available for future use.
 
 

The only drawback is if both computers need to hit the internet at the same time or something(s) off the router then bandwidth will be (roughly) split between them by the single gigabit link to the switch. It's not really an issue in most cases since you probably don't have a link over a gigabit coming into your router anyway and I doubt both computers would need to access, at gigabit speeds, two or more somethings connected off the router.
 
Edit:
Forgot to add but the "router" in this case is likely more of an all in one where those 4+ LAN ports are just a switch with an AP dangling off them and then router is just WAN to LAN on the backend.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

I found out over the weekend that one of my housemates capitalizes letters exclusively with caps lock instead of shift.
 
It's minor, but it killed me.

Yes. just yes. 

Two part scrapyard wars. Part one is building a mining computer with a fixed budget, part 2 is months later, building the best computer you can off the money you earn from part one.
 
I'd watch the crap out of that.

Two part scrapyard wars. Part one is building a mining computer with a fixed budget, part 2 is months later, building the best computer you can off the money you earn from part one.
 
I'd watch the crap out of that.

Civ5 is a game that doesn't really need a good GPU to run. What's more important is having a better CPU and plenty of RAM to spare if you want to play matches with lots of CPU opponents.

Soooooooo what happened to the thing that they filmed with Gamersnexus, iJustine, and Keyes?

There's  someone who I used to know who, when she figured out I was a computer-y person, told me in an almost-bragging way, that her boyfriend doesn't keep the side panel on his desktop. Also told me that said desktop was STUFFED FULL OF SOCKS.
 
I'm unsure why she wasn't willing to pass on the message of "OH GOD THAT'S REALLY NOT GOOD", but whatever.

There's  someone who I used to know who, when she figured out I was a computer-y person, told me in an almost-bragging way, that her boyfriend doesn't keep the side panel on his desktop. Also told me that said desktop was STUFFED FULL OF SOCKS.
 
I'm unsure why she wasn't willing to pass on the message of "OH GOD THAT'S REALLY NOT GOOD", but whatever.

Not sure if this counts since it's about the monitor and not the system...
 
I'm not 100% sure what type of panel my second monitor has, but it's a type that causes the colors to wash out if it isn't directly facing you. Since I live in a college dorm, and space/options are limited, I decided to use a combination of zip ties and string to suspend it from the ceiling at the correct angle.
 
Now I just can't let an RA in my room. Ever.

Not sure if this counts since it's about the monitor and not the system...
 
I'm not 100% sure what type of panel my second monitor has, but it's a type that causes the colors to wash out if it isn't directly facing you. Since I live in a college dorm, and space/options are limited, I decided to use a combination of zip ties and string to suspend it from the ceiling at the correct angle.
 
Now I just can't let an RA in my room. Ever.

I go swimming in a lake filled with it.