On: 64-bit Orange Pi – A Quad Core Computer for $20

[Dwolb]

Typically designers would turn a part to better align interfaces. e.g. if you have to chips which need to be connected you might rotate one to get the 'straighter' traces.

This looks like it might be to align the DDR better to the main processor but who knows.

[astrodust → Dwolb]

This one looks like it was designed by a genetic algorithm or someone who just slapped the chips down randomly and wired them up. Either one.