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<?xml version='1.0' encoding='UTF-8'?>
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<topic xml:lang="en-us" id="intro-64bitguests">
<title>64-bit Guests</title>
<body>
<note>
<p>Be sure to enable <b outputclass="bold">I/O APIC</b> for virtual machines that you intend to use in 64-bit mode. This is especially true for 64-bit Windows VMs. See <xref href="settings-motherboard.dita#settings-motherboard"/>. For 64-bit Windows guests, ensure that the VM uses the <b outputclass="bold">Intel networking device</b> because there is no 64-bit driver support for the AMD PCNet card. See <xref href="nichardware.dita#nichardware"/>.</p>
</note>
<p>If you use the <b outputclass="bold">Create VM</b> process in <ph conkeyref="vbox-conkeyref-phrases/vbox-mgr"/>, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> automatically uses the correct settings for each selected 64-bit OS type. See <xref href="create-vm.dita"/>.</p>
</body>
</topic>
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