I'm working on re-creating the first computer I ever built for some retro DOS and Windows games and wanted to share this unique part that I have.

Little backstory first, I bought an ABIT BH6 motherboard way back in 2017 when I started this project and the seller threw in a Pentium 3 CPU with it. I didn't think much of it as I was planning on using a Celeron 300a and overclocking it to 450 like we did back in 1999. I had a look at the CPU that was sent to me again recently and thought this was interesting:

Looks like a standard P3, has a bit of junk on it but functions just fine.

The fan on the heat sink looks a little kludged together and is pretty noisy.

Now comes the interesting part, this is a P3 900Mhz, at least I think it is? I looked at Wikipedia and according to this (https://en.wikipedia.org/wiki/List_of_Intel_P … microprocessors), this chip was only ever released in socket 370 format. So how do I have this?

Huh, Intel Confidential, wonder how the seller ended up with this.
I'm going to assume this was an engineering sample and was never put into production since the slot format was pretty terrible to begin with. So far I've had it running at 800mhz since I have to remember all the overclocking things we had to do back in the day on the CPU Soft Menu II. Now maybe I'm reading the cartridge wrong and it's only an 800mhz part and not 900 like I initially thought? Either way, unlocked multiplier it seems. If anyone can tell me what I've got definitively I'd love to know!