Apple made three imac G4's with the PowerMac4,2 identifier -

iMac G4 700 - M8672LL/A - NVIDIA GeForce2 MX - 15" TFT - Pre-Installed MacOS: 9.2.2 & X 10.1.2

iMac G4 700 - M8535LL/A - NVIDIA GeForce2 MX - 15" TFT - Pre-Installed MacOS: 9.2.2 & X 10.1.2

imac G4 800 - M9105LL/A - NVIDIA GeForce2 MX - 15" TFT - Pre-Installed MacOS: X 10.2.3

RAM Type: PC133 SDRAM Min. RAM Speed: 10 ns

Although Apple's original specifications stated that it shipped with PC100 RAM, Apple later warned that "PC100 RAM is not to be used with iMac (Flat Panel) computers and may create performance and reliability issues".