The typical path to SSD is by either buying a SAN attached SSD specific storage system or leveraging SSD drives in an alternate drive type in a storage system. For a few years however another form factor has been establishing itself, the PCIe based SSD and there may be some areas where it has a few advantages. The cost of these systems is often well below $15k, supporting that “off the radar” sort of purchase. If you have a specific I/O problem to address or if you are going to be using a software based storage system then they are certainly worth consideration.”]
Source: https://www.darkreading.com/database-security/advantages-of-pci-based-ssds