GTX 780 on 600Watt PSU

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I have been reassured that I can run a GTX 780 on my 600 Watt FSP 50ARN PSU. However I've been looking at some benchmarks that state the Zotac 780 3GB GPU can draw 449 watts at full load. If this is the case I am not sure my PSU has got what it takes.Extreme Power supply calculator with 100% peak load recommends 519 watts. Is my PSU enough?

Specs:

15 4670K (non OCed)
Asaka Nero 3 cooler
Asus Z87-K Mobo
8GB Ram
600W FSP 50ARN PSU
120GB SSD
1TB HDD
1 PCI card
10 Watt USB 2.1 speakers
Asus VS239Hv IPS monitor

Benchmarks:
http://www.hardwareheaven.com/2013/05/zotac-nvidia-geforce-gtx-780-graphics-card-review/18/

 
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Thanks for the help. I dont really understand the whole 12 V rail business. Are my 12 V rails solely for the GPU or cpu and gpu or the whole system? If my 12V rails give a theoretical 504 Watts how does that relate to the recommmended 519 Watts given by Extreme Power Supply calculator?

I know I am dwelling on the whole PSU issue too much but if I have to swap out my PSU I reckon I will have to settle for the 770 upgrade.
 
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