Hello,
After having checked on the z820 reference guide, I confirm that the informations concerning the sata and SCU ports on the picture are inverted.
For more details :
Did you already tested this station with HP Z turbo drive first generation :
http://h18004.www1.hp.com/products/quickspecs/14992_div/14992_div.pdf
http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA5-1840ENW
Best Regards