Thoughts on Upgrading

I have a MacPro1,1 that I purchased around the end of 2007. It still is a great machine but I can't run the latest OS X. It has a 3.0 GHz Dual-Core InteI Xeon processor and an ATI Radeon X1900 XT (512MB VRAM) graphics card. The main thing I use it for is AutoCAD under Parallels. I've got a MacBook Pro 15" running Yosemite that I use for most of my computing needs. But the desktop works best when I'm working with the AutoCAD. I'm retired so it's not like I'm doing this 8 hours a day. But for the volunteer work that I do this thing really comes in handy.
My question is - is this system upgradable to get where I can run Yosemite, or should I look for a used one that can be upgraded? And what should I look for or stay away from?

cwatson69 said:

My question is - is this system upgradable to get where I can run Yosemite, or should I look for a used one that can be upgraded? And what should I look for or stay away from?

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Technically the answer is no. Officially the max. OS on early Mac Pro's like yours is OS 10.7.5.

Mac Pro 3,1's can run the latest OS "Yosemite". So if you really want a Mac Pro…a Mac Pro 3,1 or newer is what you want if you want to be able to run the latest OS version (Yosemite).

- Nick