Most games do not get much, if any, boost from an i7 7700K when highly overclocked.
You can enter BIOS [UEFI] and force the CPU to run at 4.5GHz on all cores, that way a game using 3 or 4 cores will not reduce the CPU speed. While in UEFI [BIOS] check the CPU voltage, then boot to Windows, download and install HWiNFO [64 or 32, depending on your version of Microsoft Windows]
https://www.hwinfo.com/download.php and check CPU voltage and temperatures
How to determine what version of Windows you have: press Windows+I, and then click on System, then click About [at the bottom left of the page]. System type [shows if you have 64 bit or 32 bit]
Even an average overclockable CPU can achieve 4.8GHz without a delid and yield acceptable temperatures in games. However, I do not suggest you use sustained heavy CPU benchmark or stress programs, at least until you know temperatures and voltages are fine in games and very short run benchmarks or stress tests.
After determining your CPU voltage in UEFI and in Windows [maximum voltage used in Windows] you can then begin tinkering with increasing increasing voltage in UEFI.
Whatever you currently in UEFI [BIOS] save it and give it a name like Default. Then change all cores to 4.5GHz and save that with the name 4.5 all cores. Reboot the computer and enter UEFI again.
For light overclocking I usually go directly to what I want to use, in this case 4.8GHz. Whatever your voltage is at stock configuration raise it by .040 volts accept the change but do not save it in BIOS. Enter Windows, start HWiNFO64 or 32, and play Shadow of War for half an hour. [I suggest this because you gave it as a temperature base line in your original post.]
Check the maximum CPU temperature and maximum CPU voltage used. If your temperature is below 70 degrees C and voltage below 1.375 you are good.
Next run some sort of benchmark. Heaven Benchmark 4.0 will do, no game should produce more demand on your CPU. You can also run SiSoft Sandra Lite [free version], benchmark tab, Processor Arithmetic, press F5 to run the benchmark.
The above should stress your CPU more than games. Again, check maximum temperature and voltage while in Windows using HWiNFO64, they should be below what I mentioned above.
Reboot the computer enter UEFI [BIOS] and save your settings as 4.8 all cores [or something like that]. Next, lower your CPU voltage by .005 volts, accept the change but do not save it. Enter Windows and play your game for half an hour, check temperatures and run the benchmarks I suggested and again check maximum CPU temperature and voltage.
Continue to reduce voltage by .005 volts and check games and benchmarks until a problem surfaces [screen artifacts, game/benchmark lock up, BSOD and so on]. Enter BIOS and increase voltage by .010 [.005 may be fine, however .010 yields a wider safety net].
Let us know what you find here please.
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