Thank you.
Now, while Arctic makes great airflow fans, their static pressure fans are average.
The fans you got, have 1.85 mmH2O static pressure. It's okay-ish, but nothing to be happy about. For comparison, in my PCs, the 120mm fans i have (
Corsair ML120 Pro LED), has static pressure of 4.2 mmH2O. That's more than double + then some.
Also, due to the unique layout of your Q500L PC case, your PSU will contribute into heating up PC internals, hence why you see such high temps.
Random image from the net to showcase it:
See how the PSU exhaust ends just in front of the top fan? And not being flush with top panel.
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Your PC case also supports 140mm fans, and i don't know why you bought 120mm fans, while you could've gone with 140mm instead. Going with 140mm fans is always better idea, since same spec fan, but in bigger size, offers better airflow and can be better in static pressure, than it's smaller counterpart.
For example; Arctic P14 PWM PST A-RGB has;
68.9 CFM (vs 48.8 CFM of P12 PWM PST A-RGB)
2 mmH2O (vs 1.85 mmH2O of P12 PWM PST A-RGB)
specs:
https://www.arctic.de/en/P14-PWM-PST-A-RGB/ACFAN00239A
Now, between the P12 and P14, the increase in static pressure is little and i doubt it would've made a difference. But difference in airflow is great and it could've made a difference.
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Though, do note that you can not get both at the same time: good airflow and low noise. It is either great airflow with high noise, or poor airflow with little noise. <- There is exception to this rule, but this can't be done in the PC case you have. Since you do not have any front fan mounts, while PSU takes up half of the front as well.