TDP is NOT equal to power consumption. Use this link to calculate recommend PSU wattage for your config.
[MENTION=271931]adityak469[/MENTION]
I can't use that site as the config I am buying has a mobile core i7 CPU and also the different components(RAM) are mobile components which by default use less power. Also, the laptop components can be powered by an additional PSU(laptop charger) which will take care of CPU+RAM+SSDs etc.
So basically, the 450W is solely for GPU,3.5" HDD and Speakers.
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Also, reviewers have already run GTX 980 in this config without the secondary PSU(laptop charger) and that too without any bottleneck.