title: what is difference between "-arch sm_13" and "-arch sm_20"
body: <p>I need double precision calculation in my application. According what I found on google I should add a flag "-arch sm_13" or "-arch sm_20".</p>
  
  <p>Q1: What is the difference between "-arch sm_13" and "-arch sm_20" ?</p>
  
  <p>Q2: Is there a difference in performance between "-arch sm_13" and "-arch sm_20" ?</p>
  
  <p>My GPU: GTX 570.</p>
  
  <p>Thanks.</p>