In addition to the SLASB S-Spec, this processor was also manufactured with a few production and pre-production S-Spec numbers:
| Stepping | S-Spec | AT80574KJ080NT | EU80574KJ080NT | BX80574X5450A | BX80574X5450P |
|---|
| C0 | QAMB | | + | | |
| SLASB | | + | + | + |
| E0 | QFUB | + | | | |
| SLBBE | + | | + | + |
NOTE: Engineering and qualifications samples are marked with this color