Question I have 4 fans. 3 Zalman case fans and 1 Noctua. Should I add 1 more fan or get a good replacement?

Oct 20, 2019
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I have 2 intake (Zalman and Noctua) and 2 Exaust fans (Both Zalman)

Should I get 1 good fan and replace the standard poor Zalman fan or should I just add 5th fan? I have a place for it.

And if I should add one good one, would it be intake or outtake fan?

My temps are not high but 3 of these Zalman fans are very poor standard Zalman fans and I am not really happy about them.

My system i5 8500 /RTX 2080 Gigabyte OC/ 16 GB Ram/ 750 W corsair PSU

Thanks