I've found this advise to be helpful: 
http://askubuntu.com/questions/41778/computer-freezing-on-almost-full-ram-possibly-disk-cache-problem
 
even without swap file/partition reserving some memory through the
vm.min_free_kbytes parameter help avoid the freeze.
I've reproduce it opening a lot of chrome browser windows (CTRL+t) 
Ubuntu 14.04 (64-bits) Samsung Ultra np900x3a-a01es i5 4Gb RAM SSD

I've added to /etc/sysctl.conf
vm.min_free_kbytes=131072
vm.swappiness=5

HTH

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https://bugs.launchpad.net/bugs/159356

Title:
  System freeze on high memory usage

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