i asked someone about the changine psu in my computer. i have 300w and want to change at least 450w
but he said that if you buy psus like 500w or more , it can break the mobo. i never heard of that before. in same system just different powersupply can break mobo?? because it just can handle more watt??
He's smokin crack. The only way that might have any credibility is if you were to replace a "good" quality 300w with a "bad" quality higher watt unit. Some of the unknown brands of PS were known not to be able to even meet their rated spec. Good brands are usually slightly underrated for reliability reasons.
Buy a good quality high watt PS and you won't have any problems. I would suggest getting an 80+ certified PS. They will lower your real power consumption, as well as run cooler and quieter.