Originally posted by Leonard
What about a dual core IBM G3 with Altivec? There were rumors of IBM making a G3 with Altivec (basically a G4) and IBM makes dual core chips...sooooo... put 2 and 2 together and you get... a dual core G3 with altivec (dual altivec?)?
Same problem as with Motos dual-G4s:
- the G3+SMD is vaporware. We have heard about it roughly a year now and nothing, but nothing has surfaced. The "Gobi" 750Gx was 3 month late to the market, the 750vx (single-core) is still missing. Apple can't use a chip that is not available, let alone a dual version.
- the bus is too slow for a fast dual-core chip. The 750 even uses a revised 60x-bus protocol. In contrast to G4 and G5 busses, this is a synchronous bus, meaning if the CPU wants to read data, the bus is blocked until the data has arrived. This is bad in a single-core setup (think about data coming from the HD), but worse in dual-core. So, the 750 needs a new bus interface before it can go dual.
Additional problems (not present with the Moto G4):
- the 750 has crappy spec values, meaning it is underpowered. In contrast to common mythology, the G4 is way faster per clock cycle (and this is not counting AltiVec).
- the 750 has no SMP support, this would be needed for a dual-core chip.
In summary: a dual-core G3+Altivec means a completely new chip - why go this route for a product life of a year at best?