We use the MareNostrum Universe - a non radiative SPH LambdaCDM cosmological simulation with 1024^3 DM and 1024^3 gas particles - to study the displacements between the dark matter and gas cores in simulated clusters. Such displacements are fairly common in a LambdaCDM cosmology. The 2-D displacement distribution scales roughly with (1+z)^{1/2} for redshifts 0
In the second part of the talk I will briefly introduce the MultiDark data base http://www.multidark.org/MultiDark/ which is related to a DM only simulation (2048^3 particles, 1Gpc/h) with 22,000 clusters with masses larger than 10^14 M_sun/h and a few hundred of clusters above 10^15 M_sun/h.