- Mark Ia: Commonly used naquadah generator; the latest version has 150% more power generation than the older Mark I. - Mark Ib: Used to power the X-699. Is used for portable plasma rifles. 1% of a Mark I. - Mark II: Produces 6 times the power of a Mk. I when in a constant, barely-controlled overload; on normal mode it generates 200% of a Mk. I = - Mark III: The newest batch; this larger reactor is often carried on a MALP chassis. It produces 4 times the power of a standard version; used to power Atlantis and 304s. - Mark IV: A highly advanced reactor, common onboard ships larger than a 304. Produces 8 times the power of a Mk. I. - Mark V: under development