Will it work? Also, which version of Radeon R9 280x is the best?

SkyDieRay

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Mar 31, 2015
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Hi, currently I have these in my pc:

i7-2600 @3.4GHz
asrock h61icafe
2x4GB DDR3-1333
GTS 450
And a 400W power supply.

I want to get a Radeon R9 280x , but I am not sure which version of it to get.
Also, is a 550W power supply enough?

And the last question, will these work together?