Why would he need a new PSU? I know it's probably not great but I don't see it listed and if he's saying it's 450W the 7770 is very light weight. Certainly needs checked just Odd to recommend a 430W without knowing what his 450W.is... Did I overlook the link?
That 7770 is a ghz edition.
Without knowing the brand of it, that psu is probably original OEM crap.
Changing it would be a good idea.