Wow, interesting. I always assumed it was the number of modules. I stand corrected.
Let me amend my suggestion. Let me suggest that Speccy always double the RAM speed. That would bring it more in line with the RAM speeds seen on RAM specifications, motherboard specifications, and the like. For example...
http://www.newegg.com/Product/Product.aspx?Item=N82E16813188115 - On this motherboard specification page, under "Memory Standard", the possible memory speeds are all doubled.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145347 - On this RAM specification page, under Speed, the max memory speed is doubled.