The 45nm, 3.06GHz Core 2 Duo processor inside Apple's newly updated $2,199 iMac may very well not show up in other systems. Electronista says Intel has confirmed that, once again, it has produced a custom CPU for Apple's latest creation. The iMac line normally uses regular mobile Core 2 Duos, but the 3.06GHz chip in the latest 24" system is a special, otherwise-unannounced model with a 55W thermal envelope. Today's fastest official mobile Core 2-the Core 2 Extreme X9000-runs at 2.8GHz and has a 44W thermal envelope. Intel allegedly plans a 3.06GHz mobile Core 2 Extreme X9100 for its Centrino 2 platform, but that chip will also have a 44W envelope, and it presumably won't come out until June. Electronista says the new iMacs' motherboards are still based on current Santa Rosa technology.