I'm fixing up an old system which has a core2duo 3.16ghz processor with old intel board for my cousin bro's son. Everything seems to work fine but the PSU is dead. It also has a AMD Radeon HD 5450 Graphics card. What kind of PSU should I look for? Earlier power supply was 450 Watts with some unknown PSU. The system will only be used for browsing and some downloading and watching movies, netflix and prime. Please let me know if standatd 450 Watts PSU woud be good enough.