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Crap I don't believe mine is powered which will, in my experience with this bleeding edge hardware, will cause issues..
I don't recall the listings for the splitters I purchased mentioning anything about them being powered, which is why I was surprised to discover it was powered when the first one arrived and is also why I mentioned here.
Thanks for the info - I'll post when mine gets here. Should be sometime this week.
I have a 7 card rig on a H81 BTC mobo, it is powered via molex OR sata, but i can only use 2 out of 3 slots -- and this board somehow doesnt go beyond 7 cards in W10 or in Linux - smos.
It must be something to do with the mobo. This MSI Z170A M5 Gaming with all the right BIOS may well be the reason it can support so many cards.