List of Intel Pentium III microprocessors (250 nm) (250 nm)

| Model_number | sSpec_number | Frequency | L2_cache | FSB | Mult_ | Voltage | TDP | Socket | Release_date | Part_numbers | Release_price_USD_ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pentium III 450 | SL364(kB0)SL38E(kB0)SL3CC(kB0)SL35D(kC0)SL37C(kC0) | 450 MHz | 512 KB | 100 MT/s | 4.5× | 1.93–2.07V | 33.76 W | Slot 1 | February 26, 1999 | 80525PY450512BX80525U450512BX80525U450512E | $496 |
| Pentium III 500 | SL365(kB0)SL38F(kB0)SL3CD(kB0)SL35E(kC0)SL37D(kC0) | 500 MHz | 512 KB | 100 MT/s | 5× | 1.93–2.07V | 37.52 W | Slot 1 | February 26, 1999 | 80525PY500512BX80525U500512BX80525U500512E | $696 |
| Pentium III 533B | SL3BN(kC0)SL3E9(kC0) | 533 MHz | 512 KB | 133 MT/s | 4× | 1.93–2.07V | 39.04 W | Slot 1 | September 27, 1999 | 80525PZ533512BX80525U533512BX80525U533512E | $369 |
| Pentium III 550 | SL3F7(kC0)SL3FJ(kC0) | 550 MHz | 512 KB | 100 MT/s | 5.5× | 1.93–2.07V | 39.8 W | Slot 1 | May 17, 1999 | 80525PY550512BX80525U550512 | $700 |
| Pentium III 600 | SL3JM(kC0)SL3JT(kC0) | 600 MHz | 512 KB | 100 MT/s | 6× | 1.98–2.12V | 42.76 W | Slot 1 | August 2, 1999 | 80525PY600512BX80525U600512 | $669 |