In the layout there are 3 pciex1 ( top 2.5, middle2.5, bottom 5)
that is great
THANKS!!!
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It also depends on the type of cards though. Even though you can theoretically have 5 cards, if you try and put e.g. 5 x 7990's on there, apart from the power supply to the card issue (which is solvable with more power supplies), the cards themselves will starve the PCI bus of power, causing the machine not to boot.
It's generally simpler getting more cheaper motherboards - also if you have a crash, you don't have 5 GPU's going down.