z390 build, lackluster performance

i recently finished assembling my first "proper" hack (non-prebuilt hardware, aiming for 100% functionality) using dortania's OC guide, and i've found that it seems rather sluggish, without an obvious culprit. i'll get occasional lag and stutter just using finder, without any other programs open. likewise, this novabench result is not impressive: https://novabench.com/view/2466109
i'm not terribly well-versed in the nitty gritty details of these things so i'm not even sure what i...

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