http://www-06.ibm.com/jp/solutions/deepcomputing/events/pdf/080610_Cell_Strat_JHC_Japan.pdf
- PowerXCell 32ii (2 x PPE' + 32 x SPE') is replaced by PowerXCell 32iv (4 x PPE' + 32 x eSPE)
- higher frequency (~3.8GHz)
- 100% backword compatible
- Performance on PPE significantly better
- Performance per SPE equal or better (Significantly better on applications that benefit from new instructions)
- Better inter-SPE latency
- More on-chip memory (Is it mean LS will be larger than 256KB?)
- Better main memory latency and bandwidth