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<div class="section" id="hardware-evolution">
<h1>Hardware evolution<a class="headerlink" href="#hardware-evolution" title="Permalink to this headline">¶</a></h1>
<div class="section" id="hardware-evolution-2008-2012">
<h2>Hardware Evolution 2008 - 2012<a class="headerlink" href="#hardware-evolution-2008-2012" title="Permalink to this headline">¶</a></h2>
<p>Although the XO has continued to look pretty much the same on the outside, the electronics inside have been changing. For details of the differences, refer to:</p>
<ul class="simple">
<li><a class="reference external" href="http://wiki.laptop.org/go/Hardware_specification">http://wiki.laptop.org/go/Hardware_specification</a> for the XO 1.0</li>
<li><a class="reference external" href="http://wiki.laptop.org/go/Hardware_specification_1.5">http://wiki.laptop.org/go/Hardware_specification_1.5</a></li>
<li><a class="reference external" href="http://wiki.laptop.org/go/XO-1.75">http://wiki.laptop.org/go/XO-1.75</a></li>
<li><a class="reference external" href="http://wiki.laptop.org/go/XO-4">http://wiki.laptop.org/go/XO-4</a></li>
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<p>To some extent, the changes were made to keep using high volume parts, and improve performance. The change from 1.5 to 1.75 involved a change of the processor from x86 to arm, and a reduction in power consumption of about 50%. With power management improvements, this permits the XO to last more than 3.5 hours.</p>
<p>XO-4 is available in two models, XO-4 and XO-4 Touch. XO-4 provides multi touch input on the display.</p>
<p>As you can see from the “boot time” comparison, lower power has not been at the expense of decreased performance.</p>
<table border="1" class="docutils">
<colgroup>
<col width="21%" />
<col width="26%" />
<col width="24%" />
<col width="29%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Version</th>
<th class="head">Hard Disk</th>
<th class="head">Memory</th>
<th class="head">Boot Time</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>XO 1.0</td>
<td>1 GB</td>
<td>256 MB</td>
<td>76 s</td>
</tr>
<tr class="row-odd"><td>XO 1.5</td>
<td>4 GB</td>
<td>1000 MB</td>
<td>54 s</td>
</tr>
<tr class="row-even"><td>XO-1.75</td>
<td>4 GB</td>
<td>512 MB</td>
<td>47 s</td>
</tr>
<tr class="row-odd"><td>XO-4</td>
<td>4 or 8 GB</td>
<td>1 or 2 GB</td>
<td> </td>
</tr>
</tbody>
</table>
<p>TODO: Add xo-4 Boot Time</p>
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<li><a class="reference internal" href="#">Hardware evolution</a><ul>
<li><a class="reference internal" href="#hardware-evolution-2008-2012">Hardware Evolution 2008 - 2012</a></li>
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