Does anyone know what is the maximum RAM that can be installed in cisco ASA 5540?
The 4GB DRAM is only for ASA 5580 model. It is not available for the lower ASA series.
So to answer your questions:
1. Yes, 2 GB is the maximum for ASA5540
2. ASA5540-MEM-2GB= comes with 2 DIMMS (1GB each).