AcHEe: Evaluating approximate computing and heterogeneity for energy efficiency.

•Energy consumption is a primary concern during the design of modern computer systems.•A typical approach to improve performance per Watt is heterogeneous computing.•Approximate computing is an aggressive approach to improve the energy efficiency.•We introduce 12 applications that exploit both heterogeneity & approximate computing.•We evaluate the behavior of applications under different degrees of approximation.