Gigabyte continues to call either Northbridge or Southbridge changes to their Motherboards "revisions". However, their resellers have no way of knowing when stock is picked from their warehouse which revision is being pulled.
This is very common at Newegg.com a large reseller of Gigabyte Motherboards.
Gigabyte needs to start a new model # when it changes either the Northbridge or the Southbridge and keep the Rev#s for Bios updates only.