Knock formation and its intensity for a stoichiometric ethanol/air mixture under a representative end-gas auto-ignition condition in IC engines with temperature inhomogeneities are investigated using multi-dimensional direct numerical simulations (DNS) with a 40-species skeletal mechanism of ethanol. Two-and three-dimensional simulations are performed by systematically varying temperature fluctuations and its most energetic length scale, l T. The volumetric fraction of the mixture regions that have the propensity to detonation development, F D, is proposed as a metric to predict the amplitude of knock intensity. It is found that with increasing l T, F D shows a good agreement with the heat release fraction of the mixture regions with pressure greater than equilibrium pressure, F H. The detonation peninsula is well captured by F D and F H when plotting them as a function of the volume-averaged ξ, ξ¯,(ξ= a/S s p is the ratio of the acoustic speed, a to the ignition front speed, S sp). Decreasing l T is found to significantly reduce the super-knock intensity. The results suggest that decreasing l T, as in engines with tumble designs resulting in a smaller turbulence scale, will be effective in mitigating the the super-knock development.