XFX 550W PSU enough for R7 250X + 7770 in Crossfire?

Primordial Genesis

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Jun 3, 2014
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Before anyone recommends me not to crossfire, I already own the 7770.

So I've picked out the XFX 550W PSU, and decided to couple it with a VTX3D 7770 and Asus R7 250X.

Will this PSU be enough? (My CPU will be an FX 6300)

Also will my CPU bottleneck these cards?

Cheers,

Primordial Genesis