I didn't find your model so you should link to your exact model.
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html on the page http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-3.html shows a few 650 video cards so a good choice.
That PSU looks to be the MINIMUM asked for (I read 450 Watt minimum on the pages so far) and the full review at http://www.tomshardware.com/reviews/geforce-gtx-650-ti-boost-gk106-benchmark,3463.html has me worried about longevity of the PSU. I see about 200 Watts alone for the Video card so if we want a 5 year machine we double the Watt capability of the PSU. That's a bit high at 900 so the PSU is an iffy choice here. If you can get another 100 Watts and keep the single rail +12V then you should be fine for years.
Im trying to upgrade my dell inspiron 546 due to lack of funds to build a new rig. I have bought graphics cards in past, but ive never bought a PSU or put in a PSU before, but I am sure, with guidance I could certainly do it. I want to make sure these parts will actually work with my inspiron before i buy them so thats why I am posting here today.
Vid Card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130839
I know that the current graphics card i have in now is a 220 GT and its worth about 30 dollars and its pretty old along with my computer. So I dont know if this new card would even work with my mobo or anything and i also dont know if the PSU would fit in my tower ( Its not a slim so it should? )