H730P adapter card is not supported on R640. Only H730P Mini card supported on R640. You can refer below link for various storage configuration supported  [URL]  FKW4Y is supported on R740 not on R640. 
Hi, I have dell PowerEdge server R640 and want to install raid card H730p in PCIe slot, the problem is the backplane SAS cable seems does not fit in backplane A as there is a port for power backplane. the cable i am using is 0FKW4Y. Can I use different cable? If can, may i know the part/serial number please. I search online and found nothing in my searching.
Can i use raid card H730p in riser 1 on dell R640?