Hey, I’m a total noob when it comes to pc building. This will be my first build and I want to know if I have to buy it separately. Thanks!
Yes, unless it’s a fancy motherboard that has a “pre-applied” io shield.
It comes with the board because each one is specific to the board's I/O. Nothing to worry about!
Do I really need an io shield?
Is and IO shield necessary?
No I/O shield with motherboard/case?
Question - Used motherboard has no I/O shield ? | Tom's Hardware Forum
How should I mount a motherboard with a pre-installed IO shield?
Where can I get an IO shield?
I/O shield:

1) Shield to keep electro-magnetic radiation inside of the case
2) Dust Cover / Air circulation director: The fan in the power supply shall draw air throughout the entire case and not just along the short way from the I/O area to the power supply that's usually right above.
3) Aesthetics: No ugly hole.
It's simply for covering the back of the computer, and for shielding your inputs and outputs from being jarred around and damaged when you're plugging in and unplugging things. Some people on this thread seem confused. Because it has "shield" in the name, people think it's shielding against current or EMF. It has nothing whatsoever to do with current, or EMF interfering with radios or anything else. I use radios, I also have no covers on my computer, side front or back. To add to that, the radio I have right now is inside my computer. It's really only aesthetic, there to look good because as a shield for your inputs and outputs most of them are fairly useless without being actually attached to the board and solid rather than thin and flimsy.
Learning a lot on my first (and very arduous 😂😂) build.
I realized yesterday that the pre installed io shield is preventing my motherboard with lining up with my case. I opted for a new motherboard for other reasons, but for my next install, am I supposed to push the integrated IO shield in until it “snaps” into place like a regular IO shield ? Or is it just supposed to press against the chassis?
Also WHY DONT MOTHERBOARD MANUFACTURERS HAVE TUTORIALS FOR THE INSTALLATION INTO THE CASE?! Especially for specific models. Wouldn’t be too difficult.
The motherboard I’m getting is the Gigabyte X670 Aorus Elite AX for AM5, if anyone has any experience with this board or boards like it please let me know how you went about the IO shield.
Any help is IMMENSELY appreciated ! :)