Assuming that this a final PCB revision then MSI R9 290X Lightning would require two 8-pin power connectors and one 6-pin power connector. I think that’s quite a lot of power to be delivered to one card only. It also seems like R9 290X Lightning would feature 12+3+2 phase power design.
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Based on what MSI told me I expect MSI R9 290X Lightning to be released early next year.