[install-guide/f21-branch] some people have arch questions

[Pete Travis]

commit dce8911ca06377501429eb323b5816d8542f6a3a
Author: Pete Travis <immanetize at fedoraproject.org>
Date:   Tue Dec 9 18:36:45 2014 -0700

    some people have arch questions

 en-US/Downloading_Fedora.xml |   35 ++++++++++++++++++++++++++++++++++-
 1 files changed, 34 insertions(+), 1 deletions(-)
---
diff --git a/en-US/Downloading_Fedora.xml b/en-US/Downloading_Fedora.xml
index fdb1026..650dc0f 100644
--- a/en-US/Downloading_Fedora.xml
+++ b/en-US/Downloading_Fedora.xml
@@ -14,7 +14,40 @@
   </para>
   <para>
     Each of these downloads provides a different set of default packages, but you can add to your system after the initial installation to customize it for your needs.  The installation process is the same for all spins and flavors, so you can use this guide for any choice you make.
-  </para>
+  </para>  
+      
+      <bridgehead>Which Architecture Is My Computer?</bridgehead>
+    <para>
+      Most modern systems are 64&nbsp;bit x86 architecture.  If your computer was manufactured after 2007, or you aren't sure, you probably have a <literal>x86_64</literal> system.
+    </para>
+    <para>
+      Changing a Fedora installation from one architecture to another is not supported.  Use the following table to determine the architecture of your computer according to the type of processor. Consult your manufacturer's documentation for details on your processor, or resources such as <ulink url="http://ark.intel.com/" /> or <ulink url="http://products.amd.com/" />, if necessary.
+    </para>
+ 
+       <table id="List-Processor_and_Architecture_Types" frame='all'><title>Processor and architecture types</title>
+	<tgroup cols='2' align='left' colsep='1' rowsep='1'>
+	<colspec colnum="1" colwidth="3*"/>
+        <colspec colnum="2" colwidth="1*"/>
+	  <thead>
+	      <row>
+		<entry>Processor manufacturer and model</entry>
+		<entry>Architecture type for Fedora</entry>
+	      </row>
+	  </thead>
+	  <tbody>
+	      <row>
+		<entry>some Intel Atom, Core series, Pentium 4, and recent vintage Xeon; AMD Athlon, Duron, some Semprons; and older; VIA C3, C7</entry>
+		<entry><systemitem>i386</systemitem></entry>
+	      </row>
+	      <row>
+		<entry>some Intel Atom, Core 2 series, Core i series and Xeon; 
+AMD: Athlon 64, Athlon II, Sempron64, Phenom series, Fusion series, Bulldozer series and Opteron; Apple MacBook, MacBook Pro, and MacBook Air</entry>
+		<entry><systemitem>x86_64</systemitem></entry>
+	      </row>
+	  </tbody>
+	</tgroup>
+    </table>
+  
   <bridgehead>Media Types</bridgehead>
   <para>
     Several media types are available. Choose the one that best suits your requirements.