Your future I9-10900K will have boost function up to 5.3 on few cores and/or during a certain time and/or depending temperatures. Mainly you will have 4,8Ghz on all cores all the time at stock clock (aka without OC) and that’s clearly enough.
My I7 10700K maintain 4,7Ghz on all cores with few peak to 5.1 on some cores during flight.
You can easily OC it (tutos on YT) with a fix frequency on all cores, but I don’t encourage it right now. I’m personally wait when I’ll really need it to avoid useless overheating, power consummation, etc.
Watch this:
Edit : Ho and I’m on desktop so I have a Noctua double fans top cooler. Curious to see what is done on a laptop for such a beast…