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The bottom line is that PXE in ConfigMgr 2012 requires you to have BOTH x64 and x86 images deployed to your distribution points (DP) whether you intend to use them or not! However, there are three important items to consider:
First, go into the properties of your x86 and x64 boot images and make sure the Deploy this boot image from the PXE service point is selected, as shown below.
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