MVC

run a "nvram -p" and verify that both boot arguments are present. (the kext dev one needs to be there as well as nvidia driver one)

goalque, nice catch. Would be great to compile a list of which ones work and which ones don't BTW, there is a nMP sitting in my entry, I just need to bust open the box

So in OS X it sees and can use 970 for CUDA but can't output to displays connected to 970?

johndshea, I am very interested in figuring out why most TB2 Macs can't do eGPU external display in OS X, you are one of few to report this as working Did you do any special steps?

UPDATING SO LEAD POST HAS CURRENT INFO For those who don't want to read 3 pages of our guesswork, I'm going to try to do a summation. Keep in mind that This is in regards to TB2 Macs using Nvidia GPUs only. And I am also going to include Windows info, but only if I can find it or have seen myself. I think most people find Windows easier on newer Macs and OS X more difficult. On TB1 Macs I believe the opposite was true. TB2 Macs with trouble outputting : Mac Pro 2013 OSX no output without eEFI card Windows 8.1 No way found yet for output Mac Mini 2014 OSX no output without eEFI card Windows 8.1 Requires plugging in TB after chime, no eEFI required rMBP 2014 Iris Only OSX no output without eEFI card Windows 8.1 (Untested) Tested and shown to work with some fiddling: - 2014 11" MBA - 2013 13" rMBP - 2013 15" rMBP Iris Pro + 750M (needs a reboot) - 2014 15" rMBP Iris Pro + 750M (report that toggling gfxs status app enables) Anyone with further knowledge or experience, please let me know tho keep this updated. Keep in mind that so far it has always been possible to have CUDA or OpenCl work on the card, just no external display output. Below I continue with original post. Hi, reading various threads here I have noticed that many TB2 Apple Mac machines seem to report relatively good results in Windows but frequently OS X only allows GPGPU work. As in, when using OS X you will not get output from the eGPU. This means no OpenGl, and no ability to run something like Uningine Valley benchmark. We have been able to get around this by writing a custom eGPU EFI for specific cards, but I am curious to figure out which machines suffer from the problem. Just yesterday I saw someone with a 2014 MBA report working screen output from a GTX750Ti so not all have the issue. I can now report that I am able to make this combo output to at least 1 external display in OSX. If I see the bootscreens show up on external display, all is well. I only played with this for short time using an external USB drive. If the bootscreens showed up on internal display Iwould only get black on external. Oddly, I could not enter proper clamshell mode, not sure if due to external boot drive or what. i can confirm that both eEFI GTX680 4GB and GTX7806GB functioned identically. Using a GTX980Mac Edition EFI for cMP DID NOT SHOW BOOTSCREENS AND NEVER ALLOWED EXTERNAL DISPLAY. i think someone should track which TB2 Macs are allowing eGPU with display in OSX. We will need to find common denominator, possibility there is a blacklist buried in drivers somewhere to keep displays from initializing if they weren't announced at EFI boot.

I'm sorry, I don't understand what you are asking me to do.

Are you referring to OS X or Windows? Some details on your setup would be helpful.

Hi, I think you did something wrong. Make 100% certain that the Nvidia Web Driver is the one loading. There should be an icon in the menubar at top right. It should say "Nvidia Web Driver" with checkmark by it. 970 and 980 will absolutely not work without the Webdriver loaded. You should be able to use it for CUDA but I doubt you will get display output. But you won't get anything as long as no kext loaded. Be sure that NVDA_Startup has not been re-installed without kext mod.

I think you should have stayed with 780. OS X can't use both cores it seems. Here is a single Titan Black on a 1.4Ghz Mini Note that if you drag the score Window to left (over the ball) then everyone can see what was tested. I'll plug in a 2nd Black and update this. UPDATE: 2nd Black nearly doubled score. Fast cards. BTW, if you want to be able to compare easily you might want to run the "Sala" or "Room" scenes as Barefeats uses those frequently. Also, you can attach here instead of off site, easier for others to see.

I do not believe that you are using both halves of the card, just one. A few rounds of Lexmark OpenCl Benchmark will show you one way or the other. Or CUDA-Z, but Lexmark would show for sure, OpenCl is additive, so each card can add to score. But it looks like driver only loaded for one of the two cards on the board.

Hi, working on 2014 Mini and using standard kext edits. Can make work with a special modded efi card but rest are having trouble. Anyone else on 2014 Mac Mini and Akitio TB2?

Yes, point being it is a lot easier to install the Web driver if you get the system up and running with standard OS X driver. It is literally double click and install rather than the tedious extraction, flattening, etc. As to which is faster or better I was making no comment either way. I am just pointing out that for any Kepler (other than 780Ti and Titan Black) you don't need to do all that stuff. To make the point again, my rMBP 2012 would NOT let me install while just the 650M was running. It wasn't until I had an eGPU (with no EFI) that I was able to install with ease. Then I could slide a 970 and/or 980 in once drivers there.

Hey Guys, been reading up here after one of your members posted at MR. There are a couple of steps in this guide which could be made MUCH SIMPLER and I thought I would lend a hand. First and foremost, a little understood thing is that the Nvidia Web Drivers are only needed if your card is newer than the Apple OS X drivers support. Right now that means Maxwell cards in shipping Yosemite. May also mean 780Ti and Titan Black. But for cards like GTX780 and regular Titan, you don't absolutely have to have them. And if you aren't using anything that requires CUDA, it does you no good to have them. Now, for the FUN secret, the Nvidia Web Drivers are actually designed for....Hackintoshes !!! So, the System Check for Mac Pro 3,1 and 4,1 and 5,1 is really only there to weed out other Macs with built in Nvidia cards. In fact, if you dig down in the code, it does a check for EFI. If EFI ISN'T present, it skips the system check. By definition, any card in a TB enclosure doesn't have EFI. Why is this handy? Well, if you put some small older Nvidia card in your enclosure BEFORE the GTX980 you're shooting for you can use the stock OS X drivers. This is where it gets fun, while your 9500GT or GT120 or 8800GT is in the enclosure, try running the driver installer...and BINGO it will fire right up, no package flattening, fiddle faddling needed. So install the drivers, then re-mod the NVSTartup file and overwrite the one just installed by new drivers, run a "repair permissions" and allow installer to run a reboot. BTW, has anyone ever seen a boot screen from a TB card?

When did those drivers become available at Nvdia? Long ago. Do they enable hot-plugging? Nope. Are they just for high-end cards like the GTX 780 and 970 or are they for all Nvidia cards(including GTX 650)? All Nvidia cards in OS X drivers. Are the drivers included in OS X Yosemite or are they still a separate download? separate download The Mac Pro section at Mac Rumors has full download links all the way back to 10.6.8. See stickys there.