The A4 is an System-On-Chip, so no separate GPU.<p>From <a href="http://news.cnet.com/8301-13924_3-10442684-64.html" rel="nofollow">http://news.cnet.com/8301-13924_3-10442684-64.html</a> :<p><pre><code>  By definition, the A4 is a system-on-a-chip, or SOC, that
  integrates the main processor, graphics silicon, and other
  functions like the memory controller on one piece of silicon...</code></pre>