I don’t think that issue/workaround applies to you with your Intel processor, but the command is “taskset -c 1-8” (and it’s not specific to AMD).
I’m also not sure you’ll be able to run the game directly. (Look for a way in your game client, to add launch parameters (or “arguments”) for when it launches a game. The thing is, this isn’t appending, like telling the game to use -opengl, it will have to be prepended.
I don’t know how the Epic launcher works, I’ve never used it (seething hatred for Epic here). In Steam you can both prepend and append because you can use %command% as variable for the command to launch, thus prepend and append on either side of it. like “taskset -c 1-8 %command% -opengl”
But that’s what you need to figure out how to do in the Epic client, if you want to try that command.