SQL Server 2012 Standard Edition - multiple instances and memory utilization If we have multiple instances of a SQL Server 2012 Standard Edition (which has a 64 GB memory limit) on one server which has 192 GBs of RAM, do both instances only have access to the first 64 GBs of memory, or can they access different portions of memory, so that they can each have their own 64 GB "chunk".

This is in consideration for an Active/Active cluster if both nodes fail over to a single node.
Knowing that two instances are absolutely not related to each other, i guess that you can use two instances on one server with 64gig for each. At least to my understanding, OS is the one who assigns memory to apps, so it should be fine :)