> The 8640D is [...] only a little faster than existing Peg2's G3 > and G4
1. MPC8640 vs. "Peg2's G3":
core: 1.25 GHz e600 vs. 600 MHz PPC750CXe cache: 1 MiB L2 vs. 256 KiB L2 bus: 500 MHz MPX (4 GB/s) vs. 133 MHz 60x (853 MB/s)
I wouldn't call this "only a little faster", neither core-wise nor cache-wise nor bus-wise.
2. MPC8640 vs. "Peg2's [...] G4":
core: 1.25 GHz e600 vs. 1.0 GHz e600 cache: 1 MiB L2 vs. 512 KiB L2 bus: 500 MHz MPX (4 GB/s) vs. 133* MHz MPX (1066 MB/s)
While 25% core speed increase can be considered "only a little faster", a bus speed increase of 275% and a L2 cache size increase of 100% really cannot in my book.
* The MPC7447 itself supports 166 MHz MPX (1333 MB/s) but since the Discovery II northbridge only supports up to 133 MHz MPX, the MPC7447's bus speed is restricted to that value on the Pegasos II.
