No, if you are missing the ROMB hardware, you can't use onboard RAID (ROMB = RAID On MotherBoard). Like this: [URL] The onboard controller is a SCSI controller only and does not have any RAID capability.  Each disk will be presented to the OS and could be configured in an OS-managed RAID array.  In order to use hardware RAID, you will need the kit, or you would need PERC 4 card (SC or DC).  All PERC 4 controller options support RAID 0,1,5, and 10.  
Recently came up on a few pe1750s. I noticed they do not have the black card near PCI expansion (optional perc card?) They also do not have the raid batteries to match. Is there ROMB that will allow me to do RAID 5? Or do I need to grab the card and battery off eBay.  What are the benefits of using the perc vs on board controller? 
PE 1759 TO PERC OR NOT