Running Mac Pro 1,1 with GTX 980 and Premiere.
![el capitan for mac pro 1.1 el capitan for mac pro 1.1](https://aliennerd.files.wordpress.com/2014/11/mg_1976.jpg)
If you're using CS6, there is a text file you can edit to enable 'non-supported' CUDA Nvidia cards. Time to replace the 14year old banger if you want to run software that requires macOS Sierra/High Sierra minimum. If you are using Premiere Pro CC, as long as you have CUDA drivers installed any Nvidia card with CUDA cores should be automatically detected and used. But they're not supported by your platform's chipset/firmware. Same goes for the quad-core Clovertown Xeon X5365 of the original MacPro2,1.įor macOS, you'd need at least a Harpertown/Penryn CPU like those Xeon E5462 and otherwise fitted to MacPro3,1. Your Woodcrest CPU does not possess this instructions set. MacOS Sierra and later versions require SSE4-capable CPUs. Your flashed MacPro1,1 "Quad Core" 2.66 (it isn't a real MacPro2,1 per sé) is fitted with (original) dual-core Woodcrest Xeon 5150 (one may wonder why it was flashed at all) so El Capitan is the best you can run (it was lucky enough to go that far given that Lion 10.7.5 is the last officially version supported on those old/early MacPro models). If you have tried to install a Security Update for Mojave you need to be running Mojave in the first.
![el capitan for mac pro 1.1 el capitan for mac pro 1.1](https://images.squarespace-cdn.com/content/v1/5218390de4b07c5692c4ac42/1424210867425-USSN1MBUXQMGH9YJVZID/EasyRes+1.1+Yosemite.png)
![el capitan for mac pro 1.1 el capitan for mac pro 1.1](https://c1.neweggimages.com/productimage/nb640/ABUM_131188052187177714zMTWXL5Es1.jpg)
EL CAPITAN FOR MAC PRO 1.1 MAC OS X
I guess you can't have Googled much before posting but answer is short & simple: no. El Capitan update 10.11.2 you need to be running an earlier version of Mac OS X El Capitan before you can install. This has long been covered and discussed at great length here and/or at dedicated placed such as MacRumors so you're kind of (4year) late with your query.