Mas bien será 800.
como información adicional estuvo trabajando perfectamente con esta MB :
PC CHIPS P29G (V1.0) Core 2 Duo/ P4M890/ FSB 1066/ A&V&L/ MATX Motherboard
Specification
Mfr Part Number: P29G
CPU: Socket 775 Support Intel Core 2 Duo/ Pentium D/ Pentium 4/ Celeron D Processor;
FSB 1066/800/533 MHz
Chipset: VIA P4M890 & VT8237R+
Memory: 2x 240pin DDR2-533 DIMMs, Max Capacity 4GB
Slots: 1x PCI-Express x16 Slot; 3x PCI Slots; 1x CNR Slot
IDE/SATA: 2x ATA-133 Channels; 2x SATA Ports, Support RAID 0, 1
Audio: Realtek ALC655 6-Channel Audio CODEC
Video: Embedded UniChrome Pro 3D Graphic Controller w/ 64MB Shared Memory
LAN: VIA VT6103L 10/100Mbps Ethernet Controller
Ports: 8x USB 2.0 Ports (4 rear, 4 by headers); 2x PS/2 Ports; 1x Serial Port; 1x Parallel Port; 1x VGA Port; 1 x RJ45 LAN Port; Audio I/O Jacks
Power Connector: 1x 24pin Main Power; 1x 4pin CPU Power
Form Factor: Micro ATX, 24.4 x 21 cm
Package: Retail
:http://www.cpu-world.com/sspec/SL/SL9KG.html :
Type CPU / Microprocessor
Family Intel Pentium 4
Processor number 631
Part number HH80552PG0802M
BX80552631
BX80552631T2
Frequency (GHz) 3
Bus speed (MHz) 800
Clock multiplier 15
Package type 775-land FC-LGA4
Socket type Socket 775 (LGA775)
:http://ark.intel.com/products/27479/Intel-Pentium-4-Processor-631-supporting-HT-Technology-(2M-Cache-3_00-GHz-800-MHz-FSB) :
FSB Speed 800 MHz
Sockets Supported LGA775
Ahí lo tienes, no es tan dificil. Y viendo en las placas que estuvo funcionando anteriormente
+ los datos aqui mostrados supongo que no tendras ningun problema para encontrar una placa
Saludos!!