Out of memory compiling Arria V design in Quartus II 11.1 (32-Bit)

Does anyone know the minimum memory requirement for compiling Arria V family designs in Quartus II? I consistently get the following errors when fitting, even for the simplest single component designs:

Error (114016): Out of memory in module quartus_fit.exe (1611 megabytes used)

Error (293007): Current module quartus_fit ended unexpectedly

A similar discussion for the Stratix V family (#30271) suggests that the minimum requirement is probably around 3GB, but does anyone know for sure (or know where to find out this info)?

Thanks.