do macs use chipsets like the PC ?
I'm assuming the Xserve uses some kind of chipset to use DDR with a plain old G4.
These new motorla chips look pretty good for use on a motherboard maybe.
The wierd thing is there's a few similarities with the G4 :
the G5...
32bit
32K + 32K L1 cache
256K L2 cache
1850 MIPS @ 800Mhz (2.31 IPC)
7 stage pipeline
and the G4...
32bit
32K + 32K L1 cache
256K L2 cache
2310 MIPS @ 1Ghz (2.31 IPC)
7 stage pipeline
Also, it tops out at 1Ghz
Doesn't look like a CPU in the desktop sense by any stretch of the imagination although if technologies filter down to the 75xx series we'll have faster G4s and apple could quite easily name a G4 with DDR and Rapid I/O as the G5 because it would share so many of the G5's features it would technically be a G5 in the desktop sense.
Also, notice the crossbar that's been mentioned as a future feature of the PowerPC family since before even G4 came out and the fact it's only 32bit ?
All I'm saying is, I don't care what they call the next powermac, if it's still got a 7 stage pipeline and they've added DDR support, it's 5th generation enough for me.