No, it's not recommended to use a non-K Intel CPU in an OC motherboard.
No, it's not recommended to use a non-K Intel CPU in an OC motherboard.
It's safe to use an Intel i9-9900 (non-K) with the Asus ROG Maximus XI Formula board, but ensure compatibility with over-clocking features.
Why not aim for a 9900k at that stage? That chip isn't inexpensive, so pairing it with a 2080ti doesn't really add much value. If you're spending over ~180 on the GPU, you should invest in the top-tier CPU available for it—just a rough guideline I'm coming up with, but it's the main idea. GPU performance doesn't improve much, so unless you already have the best components or need something special like an OLED display, it's not worth splurging a lot on them. Your money is there, but that's my .02.