cMP 1,1 / inatek 4006 problems

Hi,

Im having some trouble with the USB 3.0 on my cMP.

OS: 10.11.5
Mac: cMP 1,1 (2,1)
SSD: 250GB Samsung Evo 850
RAM: 32GB
GPU: Sapphire 7950 3GB

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Upon installing the PCI - no problem
When inserting a USB 3.0 external SSD or thumb drive it see's them and i can format the drives, but when i try writing to them they crash. Ive done the same steps on a USB 2.0 port and the drives are fine.

When crashing the...

cMP 1,1 / inatek 4006 problems