| Version | UPS Flavor | Compiler | Exception | Optimized | Thread-safe | Notes |
| v4_00_03a | Linux 2.4-2.2.4 | GCC_3_3_1 | X | rh7.1 | ||
| X | X | X | ||||
| GCC_3_1 | gcc3.1a | |||||
| X | ||||||
| X | X | X | ||||
| Linux 2.4-2.2.5 | GCC_3_3_1 | |||||
| X | ||||||
| X | X | X | ||||
| GCC_3_1 | X | X | X | GCC3.1a | ||
| GCC_3_3_1 | inventor: -q oiv | |||||
| v4_00_03b | Linux 2.4-2.2.5 | KCC_4_0 | rh7.3 | |||
| X | ||||||
| v4_00_03c | Linux 2.4-2.2.5 | GCC_3_3_1 | -q oiv:hepvis |