CommentStreams:645434de2f0bc16fb20148ee4b1fb8ef

I believe usb3 is limited to 96 end points which practically becomes 32 devices. I would bet that each card takes two at a time one hub and one drive. A safe bet would be 15 cards but performance and other problems may be a bigger problem long before this. For the money, these card are not cheap. You could buy old pc hardware for less and get better performance by the time you get past 10 cards.