Abstract
Recent efforts to account for the observed L[X] - T[X] relation of galaxy clusters has led to suggestions that the ICM has an apparent ``entropy floor'' at the level of K[0] gtrsim 300 keV cm2. Here, we propose new tests based on the thermal SZ effect and on the M[gas] - T[X] trend (from X-ray data) to probe the level of the excess entropy in the ICM. We show that these new tests lend further support to the case for a high entropy floor in massive clusters.
