Considering the processor, HD 7750 or GTX 650 should be the choice as anything over it will be bottlenecked by the Processor. For PSU, get Antec VP450. If budget is on the lower side then get Antec BP300 which is available at 1.8k in Infybeam.
@Garv1386 Just about every modern day Graphics Card will be bottlenecked(i.e won't be able to perform up to its full potential) due to the slow processor. It's best to do a complete upgrade of your friends PC. Also please post your max budget for the same.
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