brispuss :
The be quiet! System Power 8 500 is about an average grade of PSU. There are worse PSU's and there are better PSU's.
The SP8 500 uses average grade components, which means the PSU may or may not last for very long.
Its performance is basically OK, except for the voltage regulation which is getting up to about the limit for acceptable operation (± 5%). This means that there might be increased risk of component malfunction due to excessive variation in voltage being supplied to components.
In summary, this PSU may or may not work OK (for sometime). But as it uses slightly lower grade components, the chances of satisfactory performance is reduced compared to higher grade PSU's. But you might be lucky and get many years of trouble free operation. It also depends on how heavily loaded the PSU is, and under what ambient temperature the PSU is being run under.
For reference, there have been others using low(er) grade PSU's that have been and still are working fine for years. However, in general, these are the exceptions. Overall, higher grade PSU's usually last longer than lower grade PSU's.
Thank you for your answer!
So it means, it was not a bad choice at all, i can use it without any trouble i dont have to worry about it goes wrong, or maybe causes damage any components in the computer. (However i think it contains all the safety protections )
Naturally, i know there are a lot of higher quality PSU's what i can buy, but i had a limit. So i was just afraid it was a good decision or not.