New MSI 845 Pro ver: 1 MS-6529 socket 423 ATX PC motherboard main system board - NOS S423 Pentium 4 P4 Willamette AGP 4x PCI USB - Classic Computer Shop
What is a Socket 423?
Intel SL4X2 Pentium 4 1.40ghz/256/400/1.75v Socket 423 CPU Processor Pga423 for sale online | eBay
x86 cpus' Guide - View details on Intel Pentium 4 1,8GHz Socket 423
New Processors On Old Boards: Adapters From Upgradeware for Socket 370 and Socket 423 - THG.RU
Intel Pentium 4 2.0 GHz on Socket 423 and Socket 478
x86 cpus' Guide - View details on Intel Pentium 4 1,4GHz Socket 423