Is the performance difference between the i9 9900k and the i9 10900k such a big difference? I got all the parts for my new build last week, and if the difference is extremely big, then I might return my 9900k and motherboard for the upcoming new ones.
I only game, and since most games don't use more than 4 cores(?), and the 10900k has 10 cores, is it worth the upgrade?