What is the difference between SSD and SSD-Cached?

Our SSD VPSs are built with hardware RAID10 arrays of pure SSD storage. They are some of the fastest on the market. Our SSD-Cached VPSs are also very quick, although not always quite as fast. SSD-Cached VPSs come with more space. They store "hot" data (data frequently accessed by the server) in a RAID10 array of SSDs. Less frequently accessed data is stored on a RAID10 of HDDs. The whole process is automated by our high performance hardware RAID cards. 
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