@asian1
Are you sure about the bandwidth on the PPC 970? The number you quote sounds awfully low. For example, a 100Mhz, 64bit FSB should run at approx 800MB/s. The slowest G5 board runs at 800Mhz and 64bits. Shouldn't it run closer to 3.2GB/s?
--edit--
I just realized that I goofed. G5 motherboards use a 400MHz, 64bit dual channel bus, similiar to the newest P4 systems. They just advertise it as an 800MHz FSB. Sorry about that.