Part Number	Frequency	Features	BIOS	PCB	Notes
Intel Pentium II
80522PX233512 80522PX233512EC B80522P233512	233 MHz		Any	Any
80522PX266512 B80522P266512 80522PX266512EC B80522P266512E 80523PX266512 80523PX266512PE B80523P266512E	266 MHz		Any	Any
80522PX300512 80522PX300512EC B80522P300512E 80523PX300512PE B80523P300512E2	300 MHz		Any	Any
80523PX333512 80523PX333512PE B80523P333512E	333 MHz		Any	Any

When 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.