Upgrading GPU

Right now I want to upgrade my GPU, I have 550 TI GTX 1GB and am considering the GPU below...

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130826

Is it worth it?

Also major problem is it says you need atleast a min. of 450 wat Power supply, and I have 460...cutting it to close?

Looks like a decent performance upgrade and a pretty good price, all things considered.
An OC'ed 660 doesn't require much more power than the 550 Ti you're presently running. Power charts for the 550 Ti, stock 660 and OC'ed MSI 660 @ 1085 core/1150 boost - not appreciably faster than the EVGA ( ~ 40MHz higher) >here<. The performance charts from the same review should present a good guide versus both the 550 Ti and any other card in the same price bracket.

Thanks for the heads up! Think I'm gonna make the upgrade then!

Can calculate to make sure
http://www.extreme.outervision.com/psucalculatorlite.jsp

Also, what PSU are we talking about? What make model?

There is a picture of the PSU in the first post, it's one I got when I bought my HP computer nothing fancy im presuming. Im gonna check out the calculator right now.

+12v rails look like they have enough amps, just a question of watts now. That calculator should answer your question though. It's going to be close