I would NOT trust PCPitstop scores. They are notoriously incorrect. A scan of my system said my 'uncached' speed was over 800MB/sec (which is impossible)
Instead, I would take a look at other utilities, such as
HDTach and
ATTO Express (Click the Windows SCSI Utilities link)
If you have low scores with those tools, then you really may have a problem.
- rp