https://www.systemrequirementslab.com/cyri <- Automatic detection
https://www.pcgamingwiki.com <- figure it out manually with the wealth of information
A gaming community free from the hype and oversaturation of current releases, catering to gamers who wait at least 12 months after release to play a game. Whether it's price, waiting for bugs/issues to be patched, DLC to be released, don't meet the system requirements, or just haven't had the time to keep up with the latest releases.
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https://www.systemrequirementslab.com/cyri <- Automatic detection
https://www.pcgamingwiki.com <- figure it out manually with the wealth of information
Check Steam. It lists minimum system requirements on each games store page at the bottom.
As someone who released a game on Steam, I had no idea what to put in as the minimum requirements. I basically said "screw it" and put in the specs of the PC I started developing it on because I had no way to test it on anything else.
I always like when the recommended maximum requirements are clearly some devs high end rendering box with 256 GB of RAM and 4 Video Cards.