Dont get me wrong when I say this. I give tech support for a living:
That power supply is actually a 380-400w psu with 73-75% on 40~50 degrees operational temps in reality which had a bit of high ripple when put on load. If you bought it from Singapore, you should have bought seasonic m12 430w/antec ea430 which I am pretty sure comes in pretty much the same price tag.
Not that I am saying its a bad power supply- but it has no active pfc and the tagging actually peak efficiency. I am getting a feeling cm extreme plus 460w would have been a better choice which you get it for 2.6-2.8k in India.
^^ vr zone have done a mini test and have said that non 80+ psu does a much better job. And the amerage mentioned are on peak load but the +12v does fluctuate on load. Let's not also forget the operational temps- even in hot places in India itself.
Like I said, not that it is bad but there were better options.