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Be sure you only use a UPS with sine wave output to avoid reducing the life of your Mac Pro. The AC power coming into your home or office is a sine wave, but some UPSes generate a square wave when you are operating from battery power.
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See Install 64 GB of RAM in Your Mac Pro 1,1 or 2,1. Earlier versions will only boot with 32 GB of less.
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However, the 2006 Mac Pro will only boot with Mac OS X 10.8 Mountain Lion or newer. It is possible to install 64 GB of memory after installing the firmware update.
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Oh, and did we mention this was the first 64-bit Intel Mac? Unfortunately, it has a 32-bit EFI – but Modernizing the 20 Mac Pro to Go Beyond OS X Lion by Robert Bryant explains how to change the boot.efi file so it can run OS X 10.8 Mountain Lion and later.
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WARNING: If you have updated boot.efi on a MacPro1,1 or MacPro2,1 so you can run Mac OS X 10.11 El Capitan, DO NOT INSTALL SECURITY UPDATE 2018-001 or later. 160, 250, or 500 GB in drive bay one, and optionally 500 GB in bays 2-4. As little as 1 GB of RAM or as much as 16 GB. The buyer can choose from two dual-core Intel Xeon Woodcrest at 2.0, 2.66, or 3.0 GHz. Apple introduced the Mac Pro as a fully customizable quad-core computer.