Intel RC440BX motherboard specifications

CPU socket type:	Slot 1
* Motherboard RC440BX supports front side bus speeds of 66MHz and 100MHz. 1. Requires BIOS P10 or later Supported only on these AA versions: 718163-208 or later 723888-205 or later 724299-205 or later 2. Requires BIOS P06 or later Supported only on these AA versions: 718163-208 or later 723888-205 or later 724299-205 or later 3. Requires BIOS P06 or later 4. Requires BIOS P04 or later

Intel RC440BX CPU compatibility list

Part Number	Frequency	Features	BIOS	PCB	Notes
Intel Celeron
BX80523R266000 Celeron 266	266 MHz
BX80523R300000 BX80524R300128 Celeron 300 Celeron 300A	300 MHz
BX80524R333128 Celeron 333	333 MHz
BX80524R366128 Celeron 366	366 MHz
BX80524R400128 Celeron 400	400 MHz
Celeron 433	433 MHz				Note 4
Intel Pentium II
80522PX233512 80522PX233512EC B80522P233512	233 MHz
80522PX266512 B80522P266512 80522PX266512EC B80522P266512E 80523PX266512 80523PX266512PE B80523P266512E	266 MHz
80522PX300512 80522PX300512EC B80522P300512E 80523PX300512PE B80523P300512E2	300 MHz
80523PX333512 80523PX333512PE B80523P333512E	333 MHz
80523PY350512 80523PY350512PE B80523P350512E BX80523U350512E	350 MHz
80523PY400512 80523PY400512PE B80523P400512E BX80523U400512E	400 MHz
80523PY450512 80523PY450512PE B80523P450512E BX80523U450512E	450 MHz
Intel Pentium III
80525PY450512 BX80525U450512	450 MHz				Note 3
80525PY500512 BX80525U500512	500 MHz				Note 2
80525PY550512 BX80525U550512	550 MHz				Note 1
80525PY600512 BX80525U600512	600 MHz				Note 1

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.