Thank you for explanationYou have LC-Power Silent Giant series [LC6650GP3 V2.3] 650 Watt GREEN POWER Edition PSU, right? If so, i wouldn't use it. It's made by Great Wall and was released back in 2012.
Also, the official specs page of that PSU is taken offline, indicating that it's discontinued PSU,
And i wasn't able to find any reputable reviews of it either. I did find two questionable reviews though:
In German, link: https://www.computerbase.de/forum/threads/silent-giant-serie-lc6650gp3-v2-3-650-watt-green-power-edition.1150462
and in Polish, link: https://pccentre.pl/article/show/lc-power-silent-giant-650-w/id=17849
For RX 570 and similar 150W TDP GPU, i'd use any Seasonic unit in 500W range since those PSUs are tried, tested and proven to be safe and reliable. E.g Focus/Focus+/PRIME series.