Recent word from sources close to Motorola confirm that a significant speed bump will be timed for MacWorld Expo in July, raising current bus speeds, and seeing new 7470-based G4s raise frequencies to as high as 1.5Ghz.
The 7470 supports PC2100 DDR-SDRAM memory at 266MHz. More importantly the new G4 supports front side bus speeds of 133MHz and 166MHz, which double to 266MHz and 333MHz. The most dramatic bandwidth improvement would be a jump to 266Mhz, and although we don't know if that choice has been made, but a more modest increase to 166Mhz (2x) would be more in keeping with recent announcements. The 7470 has a little brother, the 7460, which differs by omitting support for a L3 cache. The 7470 supports up to 4MB of L3.
News source: The Reg
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