1st Gen 8 Core memory upgrade

I was thinking of adding some more RAM. Am I limited to 16Gb max with my 1st Gen 8 core or will the motherboard support 8x4Gb chips?

Apple never came out officially, but yes, if you want to, people are running 2006 era systems with 32GB.
http://support.apple.com/kb/index?page=search&q=Mac%20Pro%20memory%202007
http://manuals.info.apple.com/enUS/MacPro_MemoryDIMMDIY.pdf
http://support.apple.com/kb/HT2609
http://eshop.macsales.com/shop/memory/Mac-Pro-Memory
http://www.crucial.com/store/listparts.aspx?model=MacPro%288-core%29
http://developer.apple.com/documentation/HardwareDrivers/Conceptual/HWTechRAM/Articles/RAM_implementation.html#//apple_ref/doc/uid/TP40003899-SW11200331177
And this article is just as true for 2007 as for early 2008:
http://www.barefeats.com/harper12.html
http://www.apple.com/support/macpro/

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