The P4DC6+ has wrong CPU BIOS display "Intel Pentium 4 Processor A431MHZ (148x16.0)" when I installed dual 2.4GHz Xeon CPUs. I cannot update the BIOS because my system locks up when I want to boot from floppy.
Your BIOS version is old. Before you update the latest BIOS from our site, make sure you take CPU2 out first. After that, go into the BIOS and load Optimized BIOS defaults and adjust the CPU clock ratio in Advanced Processor Features to X24.