Hello, I recently bought a Radeon HD 7770 just got it in the mail today. Went to go buy a bigger PSU since it requires 450 can't find one in stores near me so i am just going to order one off newegg but I am wondering if i could run the card in my desktop until i get the PSU which will be about 3 or 4 days depending on my luck with shipping thanks
More aboutradeon 7770 400w
A 7770 should be ok on 400w as long as there is no other power hog in the system.
As long as there's no smoke coming out I think you'll be fine.