will 450w of iball psu will work with 7770 reply its urgent

Don't go with i-ball PSU they give around 60% efficiency that means you will get 280-300 watts and thats too low for a HD7770 which requires 500w minimum power with an additional 75w 6pin pci-e power connector. I would suggest the corsair cx600v2 a good budget PSU and if money is not a problem go for a seasonic gseries 550w or corsair TX650M.