California has energy regs that pertain to "upgradeable PCs" (if I remember the terminology correct). This is one reason why Intel is now pushing the ATX12VO s

California has energy regs that pertain to "upgradeable PCs" (if I remember the terminology correct). This is one reason why Intel is now pushing the ATX12VO standard. By doing so, the computer power supply is theoretically more efficient by getting rid of the 3.3V and 5V rails, forcing those supplies to be on the motherboard instead of being within a traditional ATX supply.