We recently adjusted the amount of RAM / memory available to all users of the High-Performance Computing Cluster (HPCC). The default all.q job queue cap has been raised from 640GB to 1024GB, a whole terabyte of memory!
Additionally, if you are not familiar with the short.q job queue, please give it some consideration. If you would like to run more than 64 simultaneous jobs, and the tasks complete in under four hours, the short.q will allow a maximum of 256 running jobs, with a total memory limit of 4096GB, four terabytes. Here is more about the short.q.