Hello, I was thinking of upgrading the computer that I have at the moment. (( http://h10025.www1.hp.com/ewfrf/wc/product?product=4107708&lc=en&cc=us&dlc=en&lang=en&tmp_track_link=ot_we/prodlink/en_us/4107708/loc:0&cc=us )) by putting in an GeForce 550 ti, plus the appropriate PSU. some people were telling me that my mobo may not be able to handle it. If not, do you think the Geforce 460 gtx would be any better?