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Whatever, ask around some more, you won't be recommended to use a 450W PSU in a GTX 570 rig. Getting a 500W would be safe. And if you want to do what you like, be my guest.

Because that is a Bangladeshi Gaming forum.

Check this out: Dual PSU

As topgear said in his first post, maximum power consumption of the GTX 570 is 370W. If that is right, a 450W is never be able to handle that rig. Even if it can, it would be too risky. So, dual PSU would be really helpful in this case, if he can afford another PSU. I've used Dual PSU, and...