Part Number	Frequency	Features	BIOS	PCB	Notes
Intel Pentium II
80523PY350512 80523PY350512PE B80523P350512E BX80523U350512E	350 MHz		Any	Any
80523PY350512 80523PY350512PE B80523P350512E BX80523U350512E	350 MHz	Slot 1	Any	Any
80523PY400512 80523PY400512PE B80523P400512E BX80523U400512E	400 MHz		Any	Any
80523PY400512 80523PY400512PE B80523P400512E BX80523U400512E	400 MHz	Slot 1	Any	Any
80523PY450512 80523PY450512PE B80523P450512E BX80523U450512E	450 MHz		Any	Any
80523PY450512 80523PY450512PE B80523P450512E BX80523U450512E	450 MHz	Slot 1	Any	Any
Intel Pentium III
80525PY450512 BX80525U450512	450 MHz	slot1	Any	Any
	450 MHz	socket370 with S370-DL	Any	Any
80525PY500512 BX80525U500512	500 MHz	Slot 1	Any	Any
80525PY500512 BX80525U500512	500 MHz	slot1	Any	Any
80525PZ533512 BX80525U533512	533B MHz	Slot 1	1025.001	Any
	533B MHz	slot1	1025.001	Any
RB80526PZ533256 BX80526F533256E	533B MHz	socket370 with S370-DL	1025.001	Any
80526PZ533256 BX80526U533256	533EB MHz	Slot 1	1025.001	Any
	533EB MHz	slot1	1025.001	Any
RB80526PZ533256 BX80526F533256E	533EB MHz	socket370 with S370-DL	1025.001	Any
80525PY550512 BX80525U550512	550 MHz	Slot 1	1025.001	Any
80525PY550512 BX80525U550512	550 MHz	slot1	1025.001	Any
80526PY550256 BX80526U550256	550E MHz	Slot 1	1025.001	Any
80526PY550256 BX80526U550256	550E MHz	slot1	1025.001	Any
RB80526PY550256 BX80526F550256	550E MHz	socket370 with S370-DL	1025.001	Any
80525PY600512 BX80525U600512	600 MHz	Slot 1	1025.001	Any
80525PY600512 BX80525U600512	600 MHz	slot1	1025.001	Any
RB80526PY600256 BX80526F600256	600 MHz	socket370 with S370-DL	1025.001	Any
80525PZ600512 BX80525H600512	600B MHz	Slot 1	1025.001	Any
	600B MHz	slot1	1025.001	Any
RB80526PZ600256 BX80526C600256	600B MHz	socket370 with S370-DL	1025.001	Any
80526PY600256 BX80526PY600256	600E MHz	Slot 1	1025.001	Any
80526PY600256 BX80526PY600256	600E MHz	slot1	1025.001	Any
RB80526PY600256 BX80526F600256	600E MHz	socket370 with S370-DL	1025.001	Any
80526PZ600256 BX80526U600256	600EB MHz	Slot 1	1025.001	Any
	600EB MHz	slot1	1025.001	Any
RB80526PZ600256 BX80526C600256	600EB MHz	socket370 with S370-DL	1025.001	Any
80526PY650256 BX80526U650256	650 MHz	Slot 1	1025.001	Any
80526PY650256 BX80526U650256	650 MHz	slot1	1025.001	Any
RB80526PY650256 BX80526F667256	650 MHz	socket370 with S370-DL	1025.001	Any
80526PZ667256 BX80526U667256	667 MHz	Slot 1	1025.001	Any
	667 MHz	slot1	1025.001	Any
RB80526PZ667256 BX80526F667256	667 MHz	socket370 with S370-DL	1025.001	Any
80526PY700256 BX80526U700256	700 MHz	Slot 1	1025.001	Any
80526PY700256 BX80526U700256	700 MHz	slot1	1025.001	Any
RB80526PY700256 BX80526F700256	700 MHz	socket370 with S370-DL	1025.001	Any
80526PZ733256 BX80526U733256	733 MHz	Slot 1	1025.001	Any
	733 MHz	slot1	1025.001	Any
RB80526PZ733256 BX80526F733256	733 MHz	socket370 with S370-DL	1025.001	Any
80526PY750256 BX80526U750256	750 MHz	Slot 1	1025.001	Any
80526PY750256 BX80526U750256	750 MHz	slot1	1025.001	Any
RB80526PY750256 BX80526F750256	750 MHz	socket370 with S370-DL	1025.001	Any
80526PY800256 BX80526H800256	800 MHz	Slot 1	1025.001	Any
80526PY800256 BX80526H800256	800 MHz	slot1	1025.001	Any
RB80526PY800256 BX80526F800256E	800 MHz	socket370 with S370-DL	1025.001	Any
80526PZ800256 BX80526U800256	800EB MHz	Slot 1	1025.001	Any
80526PZ800256 BX80526U800256	800EB MHz	Slot 1	1025.001	Any
	800EB MHz	slot1	1025.001	Any
	800EB MHz	socket370 with S370-DL	1025.001	Any
80526PY850256 BX80526U850256	850 MHz	Slot 1	1025.001	Any
80526PY850256 BX80526U850256	850 MHz	slot1	1025.001	Any
80526PZ866256 BX80526U866256	866 MHz		1025.001	Any
	866 MHz	slot1	1025.001	Any
	900 MHz		1025.001	Any
	900 MHz	slot1	1025.001	Any
80526PZ933256 BX80526U933256	933 MHz		1025.001	Any
	933 MHz	slot1	1025.001	Any
80526PY1000256 BX80526H1000256	1.0 GHz	Slot 1	1025.001	Any
80526PY1000256 BX80526H1000256	1.0 GHz	slot1	1025.001	Any
80526PZ1000256 BX80526PZ1000256	1.0B GHz	Slot 1	1025.001	Any
	1.0B GHz	slot1	1025.001	Any

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.