Question i am csgo playerrr need help on multicore conception.

May 12, 2020
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i have a really awesome cpu -

amd ryzen 7 3800x 3.9 ghz (i wont oc to anything and boost allows to 4.5)
ati radeon rx 5700 xt huge
3400 ddr4 ram 16 gig but i have it set to default ddr4 right now will xmp profile to at least 3200 okai
gigabyte b450m d3sh motherboard
corsair cv 650w non modular

i am in debate now. previously i turned off multicore rendering because it was like a plague to my cpu and fps okay.
now i checked everything mid settings and low values for linearity but...
multicore rendered?
this is true and i dont know if it is genuine result or questionable behavior. i get 300+ fps and cant reason why id need more. my understanding is when i turned off multicore in the past it just raise fps a bit and also kept system from crashing. or freezing.

now new everything and feelin’ fresh ta death. please answer