Q: Mac Pro Multiple OS on Multiple HDDs.

For what versions of windows you can run and what version of BootCamp yu have to use see:

https://support.apple.com/en-us/HT204048

To install windows via BC see:

http://www.apple.com/support/bootcamp/

Note that 4 GB of memory is really marginal. Nimix is good memory

http://www.amazon.com/4X4GB-Certified-Memory-2006-2007-MA356LL/dp/B0085MH2II

Hi Adam,

I run Windows 7 64 bit on a second HDD using the Bootcamp setup utility without issue. Personally I wuld use Win 7 64 bit if i had choice between it or any other version of Windows.

Based on:

Specs: 4GB Ram, 2.66 GHz Xeon, NIVIDA 7300GT 256MB,

The OP and a 2006/2007 Mac Pro and can only run 32 bit Win 7 and 32 bit Win Vista

System requirements to install Windows on your Mac via Boot Camp - Apple Support

32-bit Windows in a 1,1 will only address 1.9GB RAM (you need more even for Lion probably)

64-bit versions are PITA after Vista SP1 (and XP and Vista are not good candidates, support, security and vulnerable)

You could outside of gaming use Windows in a VM - adn putting OS X and Windows on SSD helps a lot with either and both, just be sure to allocate and buy 250GB SSD at least.

These:

http://smile.amazon.com/BUFFERED-PC2-5300-FB-DIMM-Arch-Memory/dp/B002ORUUAC/ref= sr_1_4?s=electronics&ie=UTF8&qid=1430858…

this:

http://smile.amazon.com/Samsung-2-5-Inch-Internal-MZ-75E250B-AM/dp/B00OAJ412U/re f=sr_1_1?s=electronics&ie=UTF8&qid=14308…

http://smile.amazon.com/Icy-Dock-EZConvert-2-5-Inch-Converter/dp/B002Z2QDNE/ref= sr_1_1?s=electronics&ie=UTF8&qid=1430859029&sr=1-1&keywords=icy+dock