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Slot 2 was never used in laptops.
Nor was slot 1 or slot A.
370 was intended to be a slot replacement but was … that’s a whole other story. And to be honest, you can probably find a slot socket in a laptop somewhere. Stupid idea. I’ll come back to that though.


The Mac-style cpu cards come in some-40 different configurations. They are reduced-surface, underpowered versions of the slot CPUs. But that’s an understatement to a degree.
Oh, and the Motorola based design actually has a name; processor direct slot. So, nobody give anyone trouble over calling a pga a slot here. Just saying.

Actually the design dates back to the late 70s. Motorola was trying to create a dual IS cpu that occupied a single board with 2 relational CPUs and co-processors. All on a high-bandwidth, low-power platform. Originally these were in house chips that carried a mos-compliant cpu and a Zilog 80k compatible.

With the aim alliance Intel began playing with a scaled down pentium as well as power processors for the design; allowing the full slot style platform on a socketed interface.
This led to both power and Intel Macs with this design. As well as laptops on the x86 is.

Back to the beginning though. Has anyone actually put a real slot processor in a laptop? Probably. I’ve seen a 409 and a 454 strapped to a go cart sled. So I’m sure someone somewhere tried the equivalent with a cpu.
But a better analogy would be building a cabin on top of a jet engine with no ventilation. They run very hot. That’s why even the upper end of entry level processors had big heatsinks stock. Any laptop that did anything would burn out very fast!

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I seen desktop Pentium 4's in lap tops a few times, Sony, IBM and Sager all put desktop Pentium 4's in laptops, I think dell did to but I could be wrong there.

AMD was more or less putting better binned desktop K6-2 and iii in laptops and not to long before any there were sk7 mmx Pentiums finding there way into laptops too sooo, yeah a desktop Pii/piii is not so far fetched when you think of that. However I never seen a slot one CPU in a loptop, I think the size and cost would make it not a option. Laptop were still fairly new around that time and cost 1000s of dollars, putting a slot 1 chip in a laptop would only make the cost that much higher.

As for heat, Pii and Piii CPUs did not run all that hot, most of them were sub 35w TDP, with the 450mhz pii being a 28w CPU. those large heatsinks were a by product of a few things, one being a massive plate between the cooler and the core, latter celly's and Piii got rid of the plate and had much smaller coolers even with the higher TDP on some chips. most PC cases of that time had no fans outside the PSU and maybe a low speed 80mm in the front of the case and a lot of the Pii had no CPU fan. Most Pii CPUs ran passive or mostly passive so a bigger cooler was needed. Finding a massive cooler on a older socket 5 Pentium and those things were what, 5-15w TDP at the most?

Now if you compere it to a mobile K6 yeah the Pii and 3 run far hotter,The K62 and 3 are around 15w TDP. but I don't think they would run so hot that it would be a problem in a laptop. A lot of modern laptop chips are in the 30 to 40w range.

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