Sometimes, engineers have some free time on their hands. There are many examples of 'skunkworks' projects, including an Asus RTX 4060 Ti with an onboard SSD slot, motherboards with rear-side connectors, and going back a little further, an ASRock X299 HEDT ITX motherboard, to name just a few memorable examples.
The latter board included SO-DIMM (small outline dual in-line memory module) slots as a way to save space due to the large size of the LGA 2066 socket. It's not the only example of a desktop motherboard with SO-DIMM slots. Asus cooked one up in its labs, and it was spotted by wxnod at X/Twitter, who posted a picture of an Asus ROG Maximus XIII Hero with SO-DIMM memory slots.
