Agossie, het ziet er naar uit dat de 500MHz van de PowerMac G4 niet deze maand uitkomt. Door errata problemen zal hij pas in december worden gereleased, aldus dit nieuwsbericht.
Sources said that the problem -- which only arises when the G4 is run at speeds of 500 MHz or higher -- can result in some corruption in the processor's data cache. Motorola's recommended workaround is to enable the "GlobalWaitR" register in the processor, which, while preventing the problem, slows timing throughout the chip.
Motorola's Technical Support Hotline confirmed both the existence of the errata and the workaround, which it acknowledged entails a "speed hit."
Although the G4 processors in shipping Power Mac G4s contain the errata, their sub-500-MHz speeds keep them from encountering the corruption problem, sources said.
Indeed, another source said, this issue might never evince itself in Macs, since the OS doesn't manipulate data rapidly enough to cause the problem -- the glitch would more likely effect more-efficient embedded operating systems. Even if data corruption should occur, a source said, the result would be nothing more than a system freeze, easily fixed with a restart.