Userbenchmark is useless for showing performance gains. The difference between those 2 cpus is much smaller than 35% - more like 10%.
1)That site is run by Intel shills. Check out reddit, Youtube, etc, on the matter.
It does have it's uses, but measuring performance isn't one of them.
2)You can't get an accurate representation of performance because the cpu and gpu there are being compared to overclocks instead of stock performance. Results will always be skewed.
@Basinho0211
The 9600K is more expensive than it appears, and it would be a 'sidegrade' for you.
1)You have to shell out more money for a cooler if you don't already have one. A Hyper 212, for example, is fine for stock operation, cuts it a little too close for a good overclock.
2)Overclocking, as well as memory XMP is locked on anything other than the more expensive Z370/Z390 mobos.
3)while the 9600K does have more physical cores, thus giving it stronger single core performance, it also has 2 fewer threads. This is going to bite you in the ass in titles that can use 6 or more threads, and would force you to upgrade again before long.
This cpu was obsolete before it even launched.
4)The non-hyperthreaded cpus, such as that one, suffer high frame time spikes when all their cores are loaded, causing stutter.