eGPU solution for imac (octane / redshift)


Hi there,
After some time away from 3D I am getting back into the game and would like to use octane / redshift for my futur work.

I have read a couple of things here and there but can’t find a clear answer…

Is there an effective way to use eGPU with an imac ?

Thanks in advance for your response!

Here are my 2 imac specs:
iMac Core i7 3.4 27-Inch (Late 2012) / NVIDIA GeForce GTX 680MX 2048 Mo / 32Go RAM
iMac Core i7 3.5 27-Inch (Late 2013) / NVIDIA GeForce GTX 780M 4GB GDDR5 / 16Go RAM


check out for all about eGPU.



I have an iMac 5k 2014 and I’ve been successfully using the script which you can find on the website mentioned above… I’m running a sonnet breakaway with a 1080TI… It’s been working fine, just spend some time reading the info on the forums. The points worth mentioning are that the epgu needs to be switched on after boot up otherwise the system won’t start, and you can’t put the Mac into sleep mode, it’ll crash. I basically shutdown at the end of each day… Another point is that the script modifies system kexts and binaries (whatever that means), and I don’t think there’s any ‘uninstall’ process, other than reinstalling the Mac OS… There seems to be a new solution available called ‘automate egpu EFI’ or something, which apparently doesn’t modify your OS system files, but I haven’t yet read of anyone running it on an iMac, so I can’t vouch for it…

Something I find when reading the posts on the forum is that most people want to either hook up a second screen to their egpu or actually use it to run their main display… Like you, I just want my egpu for rendering, so have no need to make it run any display…

My personal home Mac is an iMac Pro… I’ve been meaning to set up my egpu on that, but for the time being I’m holding off until Mojave is released… I just want make sure the current egpu solutions will work OK with Mojave beforehand…

Worth mentioning too that I’ve been using mine for Redshift, which has been fantastic.


Banek - do you like Redshift more than Octane?


I started out using Octane, then I tried Redshift. I liked them both, but for some reason I just stuck with Redshift. I don’t really have much opinion about which is better and why, they’re both good…