title: SeleniumGrid: How many instances should I run on single machine
body: <p>I have windows 7, 2 processors 64 bit, 8 GB Ram (I have six such nodes)</p>
  
  <p>I am planning to open 15-20 browsers on one machine. Can someone please tell me how many instance of a browsers should I open in one node? Nothing else is running apart from OS and selenium grid node. </p>