Esxi Host: acceptable memory overcommitment

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http://serverfault.com – How much can I overhead the physical memory of my host assigning memory to my guest machine? Example: Host physical memory:10 GB Is it acceptable for example assigning 2GB of virtual memory to 7 machines for a total of 14GB ? How much can I overcommit the memory ensuring balooning and other host memory freeing technique works fine? (HowTos)