Alright, so i have this 1gbps connections LAN connections, but my router supports upto 2.5GBPS.
Was wondering if i can use my PC on Lan and Wifi both, but only assign WIFI to Plex?
Got Windows
So why do you want to do this for a Plex connection to all your devices including normally Ethernet devices?
I want it to use 5ghz 2.4gbps wifi, as i recently got new wifi 6 router, and it would be terific to use that for this, as am segregating all my heavy use on that band and using my lights and other on the 2.4ghz band.
The questions to ask yourself.
Are all proposed Plex device connections, Direct line of sight to Router?
Is your Router elevated?
Do you have close neighbors with Wifi?
Do you have any electrical devices that will offer interference?
The distance from Router?
I know a ac Router is inviting but it can be a world of hurt if conditions are not ideal.
1 - Not direct Line, but reletively strong.
2 - somewhat
3 - no
4 - no
5 - about 15ft (around wall, through wall 5ft - wall is of 8inch)
This is not AC router, its AX, wifi6.
If wall has no steel construction it should work for you without issue.
The AX Wifi standard is impressive and should serve you well even though it is repetitively new.
It does have steel, but mesh type, it works really good.
However i want to put plex on Wifi, and rest of my PC on lan. 
that 2.5gbps is theoretical at best, you would be way better off wiring something if you can. Wifi should be a last resort.
If your Router allows to have seperate ip ranges for wired and wireless connections, and allows to setup the routing to exchange data from both ip ranges, then this should be possible. Though all devices with wireless connection would need to be in the “other” ip range.
If the wired and wireless connection of your pc are in the same ip range/subnet, there is no guaranty, that the wired connection wouldn’t be used to send the packages using your routers access point.
Also, what might seem like a high bandwith on the papers, will end up beeing small numbers in reality. You will only get a fraction of the claimed bandwith in reality. From my 1733MBit/s 802.11ac 5GHz connection I get 40MByte/s which is roughly 320MBit/s. The 1GBit wired connection outperforms it by length. But then again: 40MByte/s is not that bad ^^
The advantage of Wifi will be to a Smart TV with Ethernet limitations of 100mb/s. If the Wifi conditions are ideal.
As you have mentioned 320mb/s, this would handle any 4K title.
Then again a USB Ethernet adapter would provide greater thru put than the normal Ethernet 100mb/s connection.
Guys, my real concern is that I need my network to be empty.
The real reason why I got wifi6 is because I was unable to stream in house, initially I thought it was my wifi limitation, and I was on point, but later (last night) realized that the fault was of my lan too.
My old router supported only 100mbps on lan, that is 10mb/s at max. Which can handle 4k at 50mbps but would easily bottleneck any time.
After upgrading to wifi6 it worked like charm. 5mb/s file size.
However I need to also migrate my IOT. And am scared that my 2.4ghz will become awfully slow once I add like 15 devices to it (wifi6 should be able to be fine, but still).
So just wanted it to be on 5ghz with the dedicated band for Xbox, PS4 and Plex.
Todays routers have build in switches. Switches only exchange data from/to the switch ports involved in the communication. The other ports of the switch are not involved, thus have the whole bandwith for whatever they need. The backbone of a switch is usualy at least a couple of time of a single port bandwith.
With this in mind, may I ask you to elaborate on what “I need my network to be empty” means for you?
WiFi works on the premise of using RF as the medium. The radio controller makes use of time slicing to manage and share the medium with WiFi clients. The model is akin to ethernet hubs rather than ethernet switches.
In general, making a server connect via WiFi is bad practice. Reading your posts, it seems what you are doing is a typical of what consumers do when they try to design/re-design their network by putting on their weekend warrior network engineer hat.
Provide more topology details and what end result you are trying to achieve for more assistance. Provide specific network equipment model numbers.
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