Which Mac OS can I upgrade to?

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Hi everyone. I am a Mac newbie. I have an older mac and I need to know which OS I can upgrade to without replacing hardware. Here are my specs:
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 2 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B08
SMC Version (system): 1.7f10
Serial Number (system): G87051VVUPZ
Hardware UUID: 00000000-0000-1000-8000-0017F206A906

System Software Overview:
System Version: Mac OS X 10.5.8 (9L31a)
Kernel Version: Darwin 9.8.0
Boot Volume: Macintosh HD1

Thanks in advance :)
 

pigoo3

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Your Mac's Specs
2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
Officially 10.7.5.

- Nick
 
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Officially 10.7.5.

- Nick
Thanks Nick. Is that going to give me any wiggle room with any browser like firefox, safari or chrome? This mac is for our child to use for homework with google docs, sharing & printing etc
 
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This sounds like the exact problem I was having last week. Simply purchase OS X Snow Leopard from Apple's online store. You can either wait to have it delivered or setup an appointment at your local Apple store, bring in printed receipt, and they'll update it for you. Cost is $19.99 link below

Mac OS X 10.6 Snow Leopard - Apple Store (U.S.)

Once that is installed you can get to 10.9.5 which I believe is the most current. Hope this helps
 

pigoo3

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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
No doubt some will suggest hacking your Mac Pro to run Mavericks etc. If so ask will they warrant it will not be bricked. As Nick says Lion is the last official operating system as Mac Pros 1.1 and 2.1 whilst having 64bit architecture, they have 32bit firmware.
 

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