The original Lexar I had was an 8X. The new Vikings that I got are just as, if not equally as fast as the Lexar.
Never tried a Sandisk. Though I'm guessing they also would be comparable.
Dont get anything below a 8X and dont bother springing for the 24X professional. The S230 cant even think that fast.
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...all I ask is a tall ship and a star to steer her by.