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Thanks!
The ati 6870 card looks long to me, and since the power cable socket is on the side of the graphic card otherwise being on top in Nvidia cards, or should i go for 5850 and since i got corsair TX750w , wire management becomes an issue.
The reference design 6870 will fit, it's just under 10" long and the Lexa S can fit a card 10.5" long. It sounds like the card you're looking at is non reference though, the 6870 should have the power connectors at the top of the PCB.