Wikipedia? But it also depends on your hardware, when comparing to humans. They need to project the rating to standard non-changing hardware, even if the tests were done on a supercomputer.
Computer ratings?
Sort:
The oldest and most respected is probably this one: https://ssdf.bosjo.net/list.htm
There are lots of others. Here's one of the more popular ones: http://www.computerchess.org.uk/ccrl/4040/
where can i find the chess computer ratings