Sonnet Technologies has launched the first UK Titanium PowerBook upgrade service in partnership with MacUpgrades.

Owners of G4 PowerBooks (with a VGA port) and speeds of 550MHz and 667MHz can upgrade their Macs to 1.2GHz G4 processors with double the L2 cache - from 256K to 512K L2 cache.

Jolanda Blum, international business development manager for Sonnet, said: "Sonnet produce high-quality products so it makes sense that the service available with the G4 1.2GHz Upgrade for the Titanium PowerBook G4 should match this standard."

The complete upgrade service includes fitting, collection and return and costs £359 (excluding VAT). Upgraded machines support Mac OS 9.2 and all available versions of Mac OS X.