Quote:The Cooler Master 450 W EXTREME PLUS is good for the configuration or update to 500 W?That CM Extreme has 70% effciency . You should buy a PSU that have at least 80% effiency (80 plus) -> Pay less on electricity bills

More headroom (wattage) if you want to SLI or upgrade later . PSU degrade over time , 450W 70% is definitely not good for long run
I recommend Antec 550W 80plus
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