What is the difference between SSD and SSD-Cached?

Our SSD VPS servers are built with hardware RAID10 arrays of large number of pure SSD disks. This enables us to offer one of the fastest SSD VPS in the market. Our SSD-Cached VPS servers are also very quick, although not quite as fast. SSD-Cached VPS servers however come with more space. They store "hot" data (data frequently accessed by the server) in a SSD disk. Less frequently accessed data is stored on a RAID10 array of HDD disks. 

from http://secure.ftpit.com/knowledgebase/2/What-is-the-difference-between-SSD-and-SSD-Cached.html
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SSD比SSD-Cached的性能更优，速度更快。