hi guy,i have c2d 2.93ghz,zotac mobo 7050/610 i value,4 gb 800mhz ram(mobo doesn't suppot more than 4gb ram and game booster showing its 667mhz),generic psu 480 watts and 1tb hdd.i am currently interested in upgrade my rig.so guys which would be best gpu for my rig hd 7770 or something else.sorry for my english