I don't think they make a 603e for 3000 or 4000 anyway. I think the 603e is for A1200. I think Z-III amigas take 604e which is a full 64 bit CPU.
604e was 32bit processor. You may be thinking of 620. Or that the external northbridge bus could be used as either 32 or 64bit. The e5500 core in QorIQ P50x0 processors is Freescale/Motorola's first venture into 64bit, followed by e6500 in the upcomign AMP stuff. IBM'g G5, Cell, and PA Semi were the other 64bit PowerPCs.
http://en.wikipedia.org/wiki/PowerPC_600http://en.wikipedia.org/wiki/PowerPCThe if software is written to take advantage of chip correctly, it the 060 can perform up to twice as fast as the 040. I think this is on computational heavy heavy routines only(as it has an extra integer unit), and is not likely double the perceived performance of the OS if it were to be optimized for 060. I just don't think it would help the type of tasks the OS is responsible for. A lot of the OS functions are already patched by various CPU specific utilities(CopyMem), CPU Library, an of course you should have the correct datatypes installed for your CPU.
The biggest advantage of the 060 at 50mhz vs the 040 at 50 is that the 060 does not even require any sort of cooling at that speed where as the 040 will probably be unstable anywhere near 50 mhz.
I don't really think 3.5 and 3.9 were ever optimized or even recompiled for any CPU, let alone the PPC. Those versions are just 3.1 with shovelware(some of it PPC). Maybe I'm wrong.[/QUOTE]
