Bare Bones Software provides some entertaining 4/1 psudoscientific babble:
“We determined that the dye used to give lime iMacs their distinctive tint also had the effect of blocking ultraviolet radiation and low-energy gamma rays — just like running a green magic marker around the edge of your CDs. The remaining ionizing radiation that made it into the case was polarized along an axis that happened to coincide with the axis of resonance of the motherboard’s clock. Blocking the UV and gamma radiation raised the system’s signal-to-noise ratio, and the polarization resonance increased the system’s base clock rate by fifteen percent.”
