What is the make/model of your psu?
Older gen cards will have higher power requirements and will run hotter.
Here is a handy chart:
http://www.realhardtechx.com/index_archivos/Page362.htm
You can get a general idea of graphics card capabilities by consulting tom's gpu hierarchy :
https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
There is a section on older legacy cards.
Worth is something only YOU can determine.
If your main use is for fast action gaming, then my take is to
buy the strongest card that your budget will permit.
The price may smart for a little while.
But regrets about what might have been will last much longer.