Apple's PowerBook G4 laptops can be upgraded to 1GB of RAM with the availability of Trans International's 512MB upgrade.

The 512MB Low Profile SDRAM memory module can upgrade Apple's latest laptop up to either 768MB or 1GB of RAM and fits in either lower or upper RAM slots.

The Trans International 512MB SDRAM memory module conforms to PowerBook G4 electrical and mechanical specifications as outlined in Apple's developer documentation.

The company states that the $399 upgrades are 100 per cent compatible with Apple's latest 4.1.7 and 4.1.8 firmware upgrades. No UK price is available yet.