Need help/advice from overclockers and other performance buffs ... [View all]

Recently, I acquired a LeNovo Idea Centre 5 with a 2.9GHz (base) i7-10700 CPU. According to this review, however, the CPU is limited to 65W TPD due to an arbitrarily set parameter, PL1, which can have a big impact on performance. I found running Prime95 under Windows8.1 gave temps of around 65C and clocks around 3.6GHz, with the multiplier fluctuating between 36x and 37x. Under Manjaro Linux, with nice=-20 for mprime (the Linux port of Prime95), temps go up to 75C and clock to 4.0 GHz, with multiplier pretty steady near 40. So the first thing I'm looking into is seriously upgrading the heatsink/fan, where choices are somewhat limited by available height within the case, but multiple options are available. After that, how can I got about changing this "PL1" parameter ? I haven't messed with overclocking since the days when I had multiple Mac 7x00s tweaked up using jumpers on the MB, so I have *no* clue as to what's involved. Apparently, I can skip right over anything connected to BIOS tweaking, though, since this machine uses EFI, not BIOS, for booting. Any short, clear answers, or links to same, would be helpful.

(BTW, the main reason I"m bothering with this is that I wanted to have one CPU in the house running Win8.1 rather than Linux, b/c I am interested in several programs, Web sites, DBs, etc. where Windows is the best, or sometime only, option. Otherwise, I wouldn't bother. Oh, and I'm seriously trying to avoid Win10, although that might be the most straightforward option for tweaking this CPU. :^/ )