OWC has released a new upgrade card: OWC Mercury Extreme G4/1.3-1.33GHz Processor Upgrade w/2MB DDR L3 Cache <http://eshop.macsales.com/Item_MailList.cfm?ID=5807&Item=OWCME41330L2D> Unfortunately, it doesn't appear to be Cube-compatible. Anyone know why? - Mike