Table 1—The Cygnal 8051 is much faster than a standard 8051, and even faster than some 16-bit CPUs. The Keil compiler was used for the 8051s, Tasking was used for others, and a large memory model for all.
| CPU | Crystal (megahertz) | Sieve—10 loops (seconds) | ||
| Cygnal C8051F005 | 22.1184 | 0.43 | ||
| Intel 80C51 | 11.0952 | 8.2 | ||
| Intel 80C196 (16 bit) | 18.4320 | 1.3 | ||
| Philips XA-S3 (16 bit) | 22.1184 | 1.0 | ||