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I have a MacPro (mid-2007) with the configuration listed below:

  • Processor: 2x 2.66Ghz Dual Core Intel Xeon
  • Memory: 20Gb 667Mhz - DDR2 FB-DIMM
  • OSx: Lion 10.7.5
  • NVIDIA Chip Model 1024Mb
  • SSD: 512Gb
  • HD2: 1Tb
  • HD3: 1Tb
  • HD4: 500Gb

I've been searching how to upgrade to Yosemite directly, but I found he is not compatible anymore (only MacPro 2008 / later). There's a way to hack/workaround this problem? And why I can't upgrade my Lion to Yosemite if the hardware specs are totally compatible?

  • Surely you have a spare hard drive sitting around, now that they're $50 a TB or so? I'd suck it and see. Or have you, and it says NO? You used to be able to find machine spec spoofing software out there, but I haven't looked since the early aughts. – Wayfaring Stranger Apr 7 '16 at 15:13
  • Have you tried Google? Have a look at how to install an unsupported version of os x – user3439894 Apr 7 '16 at 15:28
  • Not strictly true @DavidAnderson It's not the Xeon that makes the difference, it's the 32-bit underpinning. From the 3,1 [2008] onwards El Capitan runs perfectly well, but the 1,1 & 2,1 need some unofficial tweaking. The last official OS for those early Mac Pros is 10.7.5. I have a friend who did tweak one up from the online guides, but decided it wasn't actually worth the effort :/ – Tetsujin Apr 7 '16 at 15:48
  • @Tetsujin: You are right. I deleted my comment. – David Anderson Apr 7 '16 at 16:08
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OK, this might be somewhat opinion-based, however...

Possible, yes.
Worth it, no.

Possible
There are tools & online guides far too long to repro or précis here on how to achieve it. It requires hacking the firmware & needs re-hacking at each update -
These guides from MacRumors are as good as they get, one for Yosemite & another for El Capitan.

Worth it?
The 1,1 & 2,1 are really end-of-life & now very slow compared to a 'modern' machine.
I really guess it depends on your budget, but you can get an absolute top-flight 5,1 [or the smart money goes on a 4,1 with the Apple upgrade kit] with two 6-core hyperthreading Xeons @3.46GHz & 64GB RAM for under £1800 in the UK. Your existing drives will just carry over [though idk about the OS itself, mine did from a 3,1 to 5,1].
The Geekbench scores on those are about 32k, that's slightly under the current top model 'trash-can' at 33k. I just checked the score for the 2.66 Mac Pro, 6k.

I took the latter path, even though I was only moving up from a 3,1 - which is now in the hands of my partner & very happily running El Capitan. I wanted a speed boost & the upgraded 4,1 was right on the money for me.

  • So you managed to install osx 10.11 on the 3.1 pro?? – MadHatter Apr 12 '16 at 18:25
  • The 3,1 needs no 'hack', it's still directly compatible. If you're looking at a newer machine, though, I'd skip the 3,1 & go straight for the 5 or upgraded 4. At current prices they're a better bet. – Tetsujin Apr 12 '16 at 18:27

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