550w psu for crossfire

[determinal7250]

Hi friends,

I am actually confused with my psu for rig. Below is my configuration
CPU - fx 6300(evo tx3)
GPU - msi r9 270x
HDD - seagate 2tb
RAM - corssair vengeance 8gb(1600)
MoBo - msi 970a g43
psu - corssair vs 550w

this is my current rig, along with I'm only having two cabinet fans, each 120mm(90cfm). I'm about. to get another r9 270x from my friend and I very much eager to set up a crossfire between the two. I'm just confused whether my psu would be able handle the load because I've just set up this rig a couple of months back and I'm in no condition of upgrading my psu now.
please help!

 

[Suztera]

No you want a decent 650W but ideally getting a 750W would be better.
A decent 750W psu would be the EVGA G2 750W or corsair HXi 750W.

 

[Dark Lord of Tech]

I would grab a decent 700w to 750w.

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($61.99 @ NCIX US)
Total: $61.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-24 11:33 EDT-0400

 

[determinal7250]

would running a crossfire of these cards give me a worthy performance bump. I hope it'll not be hectic as people make crossfire sound like, I don't have any experience in crossfire at all. I've always used single gpus my whole life.
also should I sell these two and get a 280x, will that be sufficient for psu