Microprocessor comparison
The following table compares key aspects of different IBM® microprocessors.
| POWER3 | RS64 | POWER4 | |
|---|---|---|---|
| Frequency | 450 MHz | 750 MHz | > 1 GHz |
| Fixed Point Units | 3 | 2 | 2 |
| Floating Point Units | 2 | 1 | 2 |
| Load/Store Units | 2 | 1 | 2 |
| Branch/Other Units | 1 | 1 | 2 |
| Dispatch Width | 4 | 4 | 5 |
| Branch Prediction | Dynamic | Static | Dynamic |
| I-cache size | 32 KB | 128 KB | 64 KB |
| D-cache size | 128 KB | 128 KB | 32 KB |
| L2-cache size | 1, 4, 8 MB | 2, 4, 8, 16 MB | 1.44 |
| L3-cache size | N/A | N/A | Scales with number of processors |
| Data Prefetch | Yes | No | Yes |