You can't use both CPUs at the same time with that one. If you install both eith...

formerly_proven · on Oct 21, 2023

>probably configured using a jumper

That's a lot of jumpers https://www.asrock.com/mb/Intel/P4%20Combo/

Also the two memory slots just somewhere in-between the PCI slots.

Some PCIe 1.0 (maybe also 2.0) boards did similar stuff to allow choosing between PCIe x16 and x8+x8.

the-dude · on Oct 21, 2023

Ah, oh. I suppose you are right. I just pulled that one out of zhe Google because I remember having a dual socket P4 motherboard, with just one CPU fitted though.

This was in 2001, maybe I am misremembering and it was P3?