The answer is yes.
Be advised that no SSD of any type has been "certified" by HP for the xw6600, but we've been running them in those xw generation of workstations for years now.
As I have advised before those workstations are SATA generation II, and not generation III, so that you will gain no speed benefit from using a Gen III SSD. You want your BIOS to be updated to the most recent, and set SATA emulation in BIOS to RAID + AHCI, and then it is best to do a clean install of your OS.