We now have: "Full symmetric multiprocessing (SMP) support Allows customers to easily scale their designs with multiple processors to deliver much higher system performance More block address translation (BAT) registers increased from 8 to 16 to support efficient embedded operating systems through high speed mapping of additional large blocks of data. Cache Locking Cache way locking has been added to the L1 caches, allowing key performance algorithms and code to be locked in the L1 cache. Continued support of the L3 cache on the MPC7455 helps assure system compatibility for customers of Motorolas MPC745x products" (quoted from motorola's website). Now we can have G4 computers with up to 32 processors working semetrically. This means that people wanting to push the G4 to its limits can do so with style. (you wouldn't even need a heater in that room!) I know Apple won't make models over probably 2 or 4 processors, but the 1Ghz 7455 is only $295 when bought in quantities of 10. Also, the new motherboard has 2MB of L3 cache running at 500Mhz per processor! This beats the hell out of DDR RAM on P4s except the 7455 can only support 2MB of L3 cache.