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Dual socket pentium 4? I don't think that existed. Dual xeon sure, lots of those.

I haven't found a system with multiple Pentium 4s (but I think NetBurst Xeons were literally pretty much Pentium 4s without disabled SMP?).

That said, who knows, I almost wouldn't be surprised; there's been loads of weird unique systems. Compaq SystemPro had custom SMP support to allow for dual 386s, which IIRC is even supported by Windows NT 3.1 officially. I think IBM x445s had some custom crazy interconnect for 32-way Xeon MPs, etc.

Sure they did, the AsRock P4 Combo for example ( didn't find any in laptop form-factor though ).

You can't use both CPUs at the same time with that one. If you install both either something will explode, nothing will happen, or it'll just use one of them (probably configured using a jumper)

>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.

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?

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