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Cf 7870

You need 2 -6 pin pci-e power connectors for each card.
Most 600 watts only have 2.
I'd upgrade to a psu that has the connectors to avoid adapters ,and take the doubt of are you powering things correctly ?, out of the equation. When it comes time for possible troubleshooting.
http://www.tweaktown.com/articles/4...ference_video_cards_in_crossfire/index16.html

4597_42_amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire.png
 
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