Hi, I am using arena 3.5.1 Build 2861 for Rodent III. It seems: (1) no parameter in configuration for selecting number of threads. (2) the hash size is maximum 1024 Mb. If I set to 2048 Mb, error message "rodent_III_x64.exe has stopped working" My laptop has 6 Gb of RAM Best regards, Koh, Kah Huat