They are all 12V I believe, just have different amperage.
Here is the link to the 1900RPM ones, spec for the 1600 and 1200 RPM one are also on that page with the model #s
http://www.sidewindercomputers.com/scsf75cfms12.html
Here is the link to the 1900RPM ones, spec for the 1600 and 1200 RPM one are also on that page with the model #s
http://www.sidewindercomputers.com/scsf75cfms12.html





