Is my PSU enough for future upgrades?

[smoothjk]

I currently have this PSU (Antec TP3-550W):
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371002

My system is running fine now (see sig), but future upgrades will probably include an ATI 4870 along with a Phenom 9950, or some other quad-core AMD. I might also throw an extra HDD in there.

Question is, will I need to upgrade my PSU? Or is it fine for a while?

 

[Dystopia]

I am going to say with a quad and a 4870, you will need a better PSU. 550W is just not going to be enough. BUT you can try it out first...