The difference between 4.4 and 4.2 is <5%. You are going to be spending money to ‘maybe’ achieve a performance boost that is only detectable in benchmarks. Why not just use PBO?
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True...but if he's just doing this to get better gaming performance, which is very light loads, then he might actually suffer an FPS decline at 4.2Ghz.
Whether that matters is arguable, but that properly set up PBO will keep it boosting at 4.4Ghz (one core at a time) or higher if he's not degraded his CPU already which will get the same gaming performance as his all-core 4.4Ghz overclock on an expensive new motherboard. The PBO will need much better cooling than stock, of course, but not as good as a 4.4Ghz fixed all-core.
My 3700X on PBO keeps one core (not the same one, of course) almost constantly at 4425Mhz while gaming which is all it needs.