There are discredited rumors that Apple used a 7458 (which doesn't exist) in some of the last PowerBook G4 models. Only used in third-party accelerator boards. PowerPC 7448 - code named 'Apollo 8', contained 1 MB onboard L2 cache, but did not contain 元 cache support.A drop-in replacement for any 7455 running at the same voltage. PowerPC 7457 - operated at 1.1 to 1.3V with 512 KB onboard L2 cache and also supported an external 元 cache.A revised 7447A was used in the last 1.67 GHz Aluminum PowerBook G4 models. PowerPC 7447 - code named 'Apollo 7', contained 512 KB onboard L2 cache, but did not contain 元 cache support.Used in the Titanium PowerBook G4 models between 867 MHz to 1 GHz. PowerPC 7455 - supported an external 元 cache.PowerPC 7445 - code named 'Apollo 6', used in iMac G4 models between 800 MHz to 1.25 GHz.Used in the Titanium PowerBook G4 models with DVI video.

PowerPC 7451 - a minor 'errata' update of the 7450 with external 元 cache support.PowerPC 7441 - code named 'Goldfish', a minor 'errata' update with nearly identical specs as the 7440.Used in Power Mac G4 models between 667 to 800 MHz. PowerPC 7450 - operated at 2.5V with 256 KB onboard L2 cache and also supported an external 元 cache.Used in Titanium PowerBook G4 models with gigabit ethernet. PowerPC 7440 - code named 'V'ger' and sometimes called 'G4 Plus', operated at 1.5V and contained 256 KB onboard L2 cache, but did not contain 元 cache support.Pin compatible with latter PowerPC G3 processors, making possible upgrades of PowerBook G3 'Pismo' models. PowerPC 7410 - code named 'Nitro', a low power version with support for up to 1 MB L2 cache, used in the first Titanium PowerBook G4 models between 400 to 500 MHz.PowerPC 7400 - code named 'Max', supports up to 2 MB L2 cache and used in the first 'graphite' Power Mac G4 models between 350 to 500 MHz.Though the IBM and Motorola versions use compatible instruction sets, the hardware logic implementations are very different from one another. They were touted by Apple for containing a ' Velocity Engine', a 128-bit vector processing unit marketed as AltiVec by Motorola, and Vector Multimedia Extension (VMX) by IBM. G4 processors contained a 32 KB instruction cache, a 32 KB data cache, and varying levels of support for L2 and/or 元 caches.

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