Terwijl AMD (en in mindere mate Intel) al vrolijk processors bakken op 800MHz, blijkt Motorola nog steeds met zware problemen te kampen bij de produktie van de G4. De huidige G4 architectuur, met name de korte pipeline, blijkt niet geschikt te zijn voor hoge kloksnelheden. Zowel van Motorola als IBM is het niet te verwachten dat zij de 500MHz G4 binnen afzienbare tijd in volumes kunnen produceren, daarvoor zullen we moeten wachten op de verbeterde G4+ met 256KB on-die L2 cache:
Motorola continues to experience major problems producing 500MHz PowerPC 7400 (aka G4) CPUs, with yields down to as little as one per cent, according to industry sources cited by AppleInsider.
Said sources claim that the problem lies with the G4's architecture and Motorola's copper fabrication process.
[...] Comment from IBM Microelectronics sources suggests tends to confirm there are major problems with the current version of the G4. IBM is, of course, now ramping up G4 production following an agreement to produce the CPU for Apple. IBM always said it would be Q2 2000 before the chip entered volume production, so there seems little hope for 500MHz or faster PowerPC G4s in the immediate future.
Motorola is said to be working on the next revision of the G4, which, it's hoped, will solve the problems limiting the production of the current iteration. What's not clear at this stage is whether the next release will be a modified G4 or the G4 Plus, Motorola's attempt to rebuild the G4's architecture to allow it to support clock speeds of 700MHz and up.
Zie voor meer info dit artikel van The Register.