This is what happens when designers have to look down at the same box they had almost a decade ago.

We showed you a detailed modular Mac Pro design concept in September posted by designer Peter Zigich. Today, Zigich is back with another future Mac Pro concept that imagined Apple ditching Intel for a custom Apple-designed ARM CPU, “A10″. We’re not sure Apple is ready to take the jump to ARM in the first major refresh of its Mac Pro line since 2010, but the prospect of a smaller, possibly Mac mini-like design for a new Mac Pro is definitely intriguing. The PCI slots are probably not necessary thanks to Thunderbolt, and Zigich doesn’t rule Intel out entirely. While these specs are maybe not completely realistic for an upcoming Mac Pro refresh, it certainly gets us thinking about what Apple might have planned for its aging Mac Pro design. More images available on Zigich’s website here.