Power supply 2x8 pin connector

Aug 8, 2018
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Hey there i want to buy gtx 770 (doubt it) or Radeon HD 7950 i prefer radeon but still question is same they both have 2X8 pin connector at top of gpu so i wonder how much it will cost for that power supply (Low budget) or is there any way that it gonna work on my 550 W power supply with 6 pin connector?
 
I'm seeing the 7950 requires two 6 pin and the 770 requires a 6 pin and an 8 pin (maybe I'm misreading).

I just purchased a Corsair RMx 750 from Amazon for $99 that should work....but for the 7950....if you have two 6 pin plugs....you may be all set already.
 


What 550w psu?