Part Number	Frequency	Features	BIOS	PCB	Notes
Intel Pentium III
80525PY450512 BX80525U450512	450	4.5 x 100 MHz, Katmai	The latest	A
80525PY500512 BX80525U500512	500	5 x 100 MHz, Katmai	The latest	A
80525PY550512 BX80525U550512	550	5.5 x 100 MHz, Katmai	The latest	A
80525PY600512 BX80525U600512	600	6 x 100 MHz, Katmai	The latest	A

Part numbers are not supplied by motherboard manufacturers. We use best guess approach to determine part numbers based on CPU model, frequency and features. In some cases our guess may be incorrect or incomplete. Please always verify part numbers before committing to buying the CPU.