Whether or not you "need" a new PSU depends entirely on how long you want your new hardware to last.
What is the EXACT model of your current PSU?
Corsair 650w ....like 8 years old.
https://www.newegg.com/Product/Product.aspx?Item=N82E16817139005
As far as the rest of the parts go, it would be helpful to know what your expectations are.
What resolution and refresh rate is your monitor? Does it have Gsync or Freesync? Do you have multiple monitors? If yes, are they all used for gaming or are secondary displays used for other than gaming primarily?
Old monitor. New 1440p prob will be on the way after or along with the new build.
What quality settings are you looking to target?
What kind of games do you typically play?
Any and all. From high frame rate mindless shooters, serious rpgs like Witcher 3, turn base Phantom Doctrine ...and great stuff like Into the Breach. (Not so much racing ever, though)
Do you have a preference when it comes to Intel or AMD?
Built 4 or 5 rigs over the years with only Intel but only bc thats what I was used to.
Don't really care as long as it works well, I guess
Does your case support ATX form factors or is it a smaller mATX or micro-ITX case?
Hmmm, not 100% sure if does smaller then regular ATX. OP'd ATX bc thats what the current
mobo is.
Thanks