The Intel® Pentium® III processor is supported only on N440BX server boards shipped from Intel since September 1998. Some of these boards will require a BIOS and firmware upgrade for Pentium III processor support. Use the following matrix to determine the capability of your board.

The AA or PBA number can be found on a small sticker located next to the N440BX server board's ISA slot.

PBA number	Revision level	Notes
681234	Prior to -507	does not support Pentium III processors
	-507	supports Pentium III processors with upgrade to BIOS 9 or later and BMC53 or later
	-508
	-509
	-520 and later	supports Pentium III processors as shipped from Intel

AA number	Revision level	Notes
694708 (TA 694709)	Prior to -207	does not support Pentium III processors
	-207	supports Pentium III processors with upgrade to BIOS 9 or later and BMC53 or later
	-208
	-209
	-220 and later	supports Pentium III processors as shipped from Intel

PBA number	Revision level	Notes
703861	Prior to -207	does not support Pentium III processors
	-207	supports Pentium III processors with upgrade to BIOS 9 or later and BMC53 or later
	-208
	-209
	-220 and later	supports Pentium III processors as shipped from Intel

AA number	Revision level	Notes
717043	Prior to -207	does not support Pentium III processors
	-207	supports Pentium III processors with upgrade to BIOS 9 or later and BMC53 or later
	-208
	-209
	-220 and later	supports Pentium III processors as shipped from Intel

All N440BX server boards support Pentium II processors with a 100 MHz Front Side Bus (FSB) running at 350 MHz, 400 MHz, or 450 MHz with 512 KB of integrated L2 cache.

The 450 MHz Pentium II processor requires BIOS 6.2 or later.

The N440BX also can be used with the 266, 300 and 333 MHz Pentium II processors, which have a 66 MHz system bus, but has not been fully tested in these configurations.