you allways got 8pin connectors in the box with the gpu, you just wired them to 2 "Ide" standard 4pin ( like for the fan and other ) from your PSU. Should be the same with the 290.
The cables go through my logic/motherboard, not the PSU. Only rated to supply a max of 225w through the cables. Some folks use a 6-8 pin adaptor, some have success, some have issues, few end up with a dead system.
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