This is a Dell Dimension XPS 4100 case. I gutted it and put its Pentium III parts into another case. The first order was to clean everything. Air compressor got rid of most of the dust and everything else was wiped down. Even the edges had grime on them removed via q-tips.

Dell and Micron used Palo Alto ATCX cases for several years in the late 1990s. They are roomy, albeit narrow, but can take ATX motherboards. There were a couple issues here... I couldn’t use the motherboard’s I/O shield and I had to snip a piece of metal from the rear so it wouldn’t interfere with my power supply’s on/off switch.

Parts!
Gigabyte GA-Z170-HD3P LGA1151 ATX motherboard
Rosewill 80+ modular power supply
Intel Skylake 6700K processor
32GB DDR4 RAM
ZALMAN CNPS9500 AT 2 cooler (just short enough to fit!)
A couple of ARCTIC F9 PWM 92mm fans
NVIDIA GTX 745 4GB (I don’t really game anymore but I had this lying around)
256GB Samsung 950 PRO M.2 NVMe SSD
2TB 7200RPM SATA HD
Beige DVD/RW SATA drive
3.5" USB 2.0 + 3.0 front panel, spray painted
Windows 10

The front panel header had a pin blocked so it wouldn’t fit originally. Removed the pin filling with a needle and it works fine.

Messy cables... I tried to tuck some behind others and into crevices to keep them away from the fan and cooler. The front panel connector is just long enough to reach. I still had to modify the plastic part that holds it in place.

Closeup of the fan + cooler

dem ports... just need to put in some serial + parallel ports and a 56K PCI modem

The front, complete with a Skylake sticker. I chose to use the older style front bezel and I found one for $8 shipped on eBay.

A slightly angled view.

dat ass

Original service tag + Windows 98SE product key included.

It’s ALIVE! It also runs really quiet, which was a bit surprising.

The desk setup

Speccy

Idle temps

Prime95 benchtesting

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It was fun! Always wanted to do something like this. dat sleeper build.

UPDATE! Some more pics.

Deyellowed the drive bay panels. Not perfect but a definite improvement.

Comparison