I picked this up for a Christmas holidays project - if you believe the sticker on the outside then it's a Pentium MMX machine, but it's actually a 486 DX4 100 OD.
The motherboard is an example of classic 90s sleaze - the PCChips M915i. It's an interesting motherboard really, PCI and VLB, but of course it has fake cache. This can be corrected from what I read but that's a project for another day. I actually picked this up for the case, which is one I owned back in the day. From memory I ran a Cyrix based machine in it and clearly remember drilling holes in the bottom front of the case - why? Airflow I guess, or speed holes?
Anyway I'm going to try and recreate that machine, minus the drilling. It was filthy but is coming up well so far - I'm particularly pleased with the plastic which hasn't yellowed much at all. The PSU was revolting and has already been binned. Good times.
Anyway it's an interesting little PC - I get the feeling that the configuration is original, based on the vendor name stickers I found here, all the screw types matched, etc. It makes that Pentium sticker all the more mysterious - I wouldn't be surprised if it was put there for trickery purposes by the vendor. If 'hi-micro' could sleep at night after selling peeps a machine with fake cache, then why not trick 'em into thinking they're getting a Pentium too?
If it's broke, then fix it!