Thanks for the details. abcd connector shown here is for NVMe configuration. It is only supported if you have NVMe SSD drives on the backplane
has anyone done the abcd configuration on the dell poweredge R730 backplane?  I see it as an option in the manual, and if I'm reading it correctly it should give each drive it full speed, and not split 2 sas cables between 24 drives (correct)?
dell poweredge R730 backplane abcd configuration