PC Server 330 (Type 8640-Exx) System/Processor Board

 

see > Pentium-Pro Processor Card Jumper J9

 
Upgrade OPTION - Pentium® II (Klamath) - Processor-Card - Jumper Settings

 

  If a PCI/ISA system board is installed (8640-330 models ES0, ES2, EM2, ESS) the J12 should be placed on pins 2-3.