I am running OpenLCA 1.10.2 in Windows 10 Pro with 1.8 GHz CPU and 8 GB of RAM. According to the Manual should be more than enough to run "very complex product systems" (It says: "It is recommended to increase this value for calculating very complex product systems (e.g. to ~4,000MB", pg. 17, 1.10 User Manual).
It runs after allocating 6 GB, but the performance is quite poor. It takes >2 minutes to calculate the impacts (Quick Results) of a single process (both Unit and System processes).