I'm confused. You didn't want to spend more than $90 for a new GPU, so you buy an old one that is extremely power hungry, so much so, that you wonder if your PSU can handle it, right?
If your PSU can't make it, do you use it as a paper weight, or return it, or get a new PSU to make sure you can use it?
If any of the above, besides returning it, is the option, didn't you just spend more money on it than $90?
It's up to you man. It was a good card in its day - like 2 years ago. I would have gone with a different card myself, but you've already got it, so hope it works for you.