Question is my Powerex RexIII 2.3 ver. 600 watts?

[AloofVern]

is my Powerex RexIII 2.3 ver. 600 watts compatible with intel core i5-3570, 8gb ram, AMD rx 570 and a motherboard GA-P61-S3-B3 Lga 1155?

 

[PC Tailor]

Welcome to the forums my friend!

Just a reminder that it's less about the overall wattage, and more about the quality of the PSU. My understanding of the Powerex PSUs are they are very poor quality, so you will want to upgrade as to prevent possible isntability or risk to other components.

As for phyiscal power, it does supply a good amount on the 12V rails, but again that doesn't speak for the quality, I can't find a proper spec sheet outside of rail outputs for the PSU.

Even JonnyGURU in this thread https://linustechtips.com/main/topic/1059962-question-about-stress-testing/ said:

That Powerex REX III is a scary PSU.

 

[AloofVern]

How about Hec Win+ 600watts 80plus? and FSP500-60APN?

 

[PC Tailor]

I couldn't comment for the HecWin+ PSU, however I've never heard of it, which is another red flag.
The FSP isn't terrible perhaps, but outdated and probably not suited for gaming rigs nowadays, but I'd imagine it's an improvement over the Powerrex.

A cheap PSU is usually a bad one.

What manufacturers are available where you are?