What board are you overclocking on and what RAM do you have? The 11th gen Intel CPUs do gain a fair bit in performance by manually tuning your RAM timings as well as knowing when to use Gear 1 and Gear 2. The Gear modes are the difference in running your memory in a 1:1 spec with your memory controller where as Gear 2 runs it 1:2. Gear 1 is better if you have low latency memory and can tighten the timings, where as Gear 2 will allow for higher memory frequency (if your memory can support it) with looser timings. You can run Gear 1 up to about 2000Mhz (DDR4000) however to do this you will need to manually adjust your VCCIO2 voltage to about 1.3v which can lead to stress on the memory controller and added heat. Past DDR4 4000 speeds you'll probably want to use Gear 2 mode as you just won't be able to run the memory controller 1:1 much past 2000Mhz. 
 
For my setup I've found that running my memory in Gear 1 at 3600Mhz with 14-14-14-32 timings is actually a small bit faster in games/benchmarks than running my RAM at 4000Mhz with 16-16-16-36 timings. My memory can't keep the same latencies at 4000Mhz and this leads to a small performance drop since 3600 CL 14 has a latency of 7.7ns where as 4000 CL 16 is at 8ns. Now the reason I've chosen those 2 speeds to compare with is I can run either of those speeds/timings with 1.4v to the memory and 1.25v VCCIO2. It's important to know what your RAM is capable of which is why I'm asking what you have. 
 
I would suggest learning more about your RAM as in what speeds it can handle at what voltages and latencies otherwise you're just shooting into the dark. 
 
A quick formula to determine latency is to multiply your CAS latency by 2000 then divide by your memory frequency. So for instance my CAS latency is 14, so we multiply 14 by 2000 to arrive at 28000 then we divide by our target memory speed of 3600 to get 7.7 (actually it's 7.777777777778) so in latency sensitive applications (like games) having lower latencies can benefit you more than raw bandwidth if you already have enough bandwidth. 

i shouldn't have to ask but is the 89C temp during stress or normal workload or idle?