Like many past spacecraft, Jupiter’s new orbiter is powered by a PPC chip:
When you want radiation-hardened CPU designs (to guard against naughty things like cosmic rays flipping bits and zapping traces), you want BAE’s RAD series, and that means you want … PowerPC. Yes, Juno’s brain is a lowly RAD750 running at 200MHz, essentially a beige Power Mac G3 with cojones of pure lead. It has 128MB of the baddest, meanest, toughest DRAM there is and 256MB of flash on board with a system bus providing 100Mbps of instrument bandwidth for pure awesome.