good one

+1 used is the best way to go

Noctua NH-D15

the d15 above is enormous, if you arent going too heavy on the oc a d14 or u14 is more than enough and will fit in your case

if your case is small you could try something like a 240mm liquid cooler but a good air cooler is better should you be able to fit it

get an AIO like a NZXT kraken or corsair h100i, if u want regular cooler go for Noctua NH-D15/D14 or scythe mugen 5.

if you want to get close to 5ghz you need to get an i7, the i5 9600k will do 4.5-4.7 on all cores usually get a closed loop water cooler or scythe mugen 5

appreciate it guys thx, last question: is it decent to get i5 9600k in 2k21? the problem is my motherboard. Its z390 chipset. And changing them both is hard.

Cpu's are pretty inexpensive nowadays compared to gpus which u can't find

you can buy a faster gpu for the same money this year than ever before. just go for the models around 200 euro and not the 400+ models. for example, a few years ago i got a second hand barely used gtx1060 for 150 euro when they were still quite new. for cpu i would recommend the 4 core ryzen 3100 or the i5 10600KF. currently for a new gpu i would pick the gtx1660 for 240 euro or radeon 5500 for 200 euro. the price performance in this price range is much better than for the 400+ models. and you really dont need a giant gpu in 2021. all the new games that come out are commercialized trash with microtransactions and bad gameplay, you wont really care about not playing them on the highest graphics settings.

+1