its done because Barts only supports dual card crossfire X.
Cayman will support quad card crossfirex
thats just the pcb, it should do 4 cards if u have some1 that makes a 2 bridge card or an x2, but ether way do u realy want more than 2 cards for anything but benching were u would not use a barts chip anyways
5930k, R5E, samsung 8GBx4 d-die, vega 56, wd gold 8TB, wd 4TB red, 2TB raid1 wd blue 5400
samsung 840 evo 500GB, HP EX 1TB NVME , CM690II, swiftech h220, corsair 750hxi
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