PSU needed with budget of about 2500

[Cool Buddy]

oh! I had completely misunderstood the efficiency rating. I used to think it's the percentage of rated capacity the PSU can supply continuously.
That means if my PC is consuming 160W & assuming my frontech PSU is 60% efficient, I'm unnecessarily wasting around 100W which is being converted to heat. So if my PSU was 100% efficient, i could have saved around Rs. 4.5 in electricity costs for every 10 hours my computer is running!

But if this be so, then Corsair VX450 will be able to supply 450W of current & then it will suffice for even HD5870. Is it like that?

 

[asingh]

Efficiency = output/input : for anything.

 

[Ronnie11]

Actually there was some link which was given here by one user which i used to calculate...frankly even i was surprised that this confi could consume 420W...& i wanted to make sure that in future the amount of power is sufficient so as to not change the power supply again...

Yeah i even i had this whole efficiency confusion...corsair vx450w had something like 80+ efficiency..what does it actually mean??i heard thos local brands have efficiency of 40% or so..what does it mean??Ps:-Thanks for the suggestion guys...frankly i almost bought the FSP Saga II 400W but in the end went for vx450w..hope it works well..yeah the price was inclusive of taxes...