I get windows blue screen on one of my Dual Xeon so I cant run it on that one at all but it runs perfectly on the other ( forever), The only difference is the cache size of the CPU`s everything else is the same, Memory , motherboard . I even tried different operating systems but it do not help. However cant guarantee that it has to do with SQ4 it might be a motherboard problem or drive who knows. Blue screen referes to Kernel 41 code which is an elusive code which even can refer to a bad PSU.