  According to common lore, Equations of State of field theories with gravity
duals tend to be soft, with speeds of sound either below or around the
conformal value of $v_s=1/\sqrt{3}$. This has important consequences in
particular for the physics of compact stars, where the detection of two solar
mass neutron stars has been shown to require very stiff equations of state. In
this paper, we show that no speed limit exists for holographic models at finite
density, explicitly constructing examples where the speed of sound becomes
arbitrarily close to that of light. This opens up the possibility of building
hybrid stars that contain quark matter obeying a holographic equation of state
in their cores.
