Regular NEOs do not work without a trace cut & soldering one wire under each BP6 socket 370.
The fastest P3s are 1100E & 1000E
They are 100MHz FSB speed & 256K cache, 1.75V
Pricey, rare & hard to get - may boot only in one socket & not in other socket too.
You can get a different Dual P3 board for ~$40-50
It will run P3 without NEOs & Tualatin with adapter.
It will do 133MHz FSB or faster & RAID IDE too.
Why spend so much on BP6 with so little to gain?