NaxHz

The latter one: I believe that's the code 35 issue I mentioned before.

Thanks for reporting back. Well, things are getting really weird... As for me, I got 100% boot success rate the past three days. Yes, every time I boot into Windows after updating the Boot Camp graphics driver, my GTX 960 is all set without any issues! I highly doubt that the code 12 issue is related to the driver conflict between AMD and Nvidia drivers - FYI, my Nvidia driver version is 364.72 - make sure you have them both up to date and try again? - Forgot to say, I only use one external monitor attached to my GTX 960 when I'm using Boot Camp.

Aha! What've you done? Maybe you should reinstall the whole Boot Camp partition then... That will be exhausting. Good luck anyway.

@unapalada Apple finally updated their AMD graphics driver for Boot Camp to Crimson Edition!! Hooray!!! Though this driver is still Boot Camp exclusive, driver version 15.301.2101, which actually is the 15.301.1901 in my opinion and is two months old already. However, our code 12 problem seems to be fixed thanks to this new release. Please let me know how is your MacBook running after updating the Boot Camp exclusive AMD driver. Is the code 12 problem fixed? Or it just happens much less frequently? Anyway, good news for us!

Same problem here, got unexpected code 12 very often. I'm using the same MacBook Pro with M370 dGPU as yours, the same AKiTiO Thunder2 case and a GTX 960 2 GB Gaming Super Clocked from EVGA, and both powered by an EVGA 500W ITX PSU. Software side I'm using Windows 10 Pro 64 bit (UEFI) with everything up to date, untouched Boot Camp drivers and the latest Nvidia desktop display driver downloaded direct from their website. Sometimes I can boot into Windows with eGPU detected and enabled successfully, sometimes only detected with code 12 and sometimes just nothing but black screens on both internal display and external monitor. And even I'm using eGPU right now, next minute when I reboot to install some programs and software updates, it fails to boot with eGPU enabled and report code 12 again, very annoying. Disenabling dGPU didn't work for me, after rebooting another error code (I think it's code 35?) appeared, told me I should contact my manufacturer to update the BIOS (sorry, what?!?!) Enabled dGPU again and I got code 12 again. Sorry, but I have no idea how to fix this, just keep trying reboot. I'm also researching for a solution... I will follow this thread and keep my eye on this issue.

Hi there, I bought my AKiTiO Thunder2 PCIe box from Strohmedia.de, but you have to sign up an account, otherwise you can't order anything. I've done some price research and compare about this box thanks to heise.de, you can see all the online offers that available to private customers here: http://www.heise.de/preisvergleich/akitio-thunder2-pcie-box-t2pc-tia-aktu-a1241207.html. I use an ATX PSU, which is for a desktop PC building, not the old Dell power brick, you know, just for safety and convenience... You can have an overview about choosing ATX PSU here: http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html Yes, I've found some for myself, but you might be also interested in. I don't know how much would you spend on the GPU, so I write all of them down below. Sapphire Radeon R9 380 2G D5 (ITX Compact), around 200 € (new) - Not recommend now, read above. EVGA GeForce GTX 960 SC GAMING (02G-P4-2962-KR), around 200 € (new) - Currently using Inno3D GeForce GTX 970 4 GB HerculeZ X1 (N97V-1SDN-M5DS), 320 € to 350 € (new) Any other ITX-form GPUs would work, read more here: https://www.techinferno.com/index.php?/forums/topic/5661-us189-akitio-thunder2-pcie-box-16gbps-tb2/. ---------- And yes, my eGPU setup is successful. I should probably open a new topic to share my setup tour... But again, very similar to Gatsby's, only I use an ATX PSU and Windows 10, and I have an external monitor at the very beginning so disabling R9 M370X is not necessary for booting up and Nvidia driver installation. Let me know if you need a full setup tour. I would write one ASAP when I have time.

Yeah man, thanks again!

Lol yeah after reading your posts I think I will just order a GTX 960 tomorrow and give it a try in the coming week. Thank you so much!!

Thanks for sharing your experience man, thank you soooooo much! Good to know that you can use R9 M370X and GTX 570 side by side, is that also possible when you using HD 7990 instead? I mean, whatever AMD or Nvidia cards as eGPU, you don't have to disable R9 M370X in order to boot up without any issues? And I'm still curious about, that is there any way to use the Crimson control panel "Radeon Settings" with both the latest Boot Camp graphics driver v15.201.xxxx for R9 M370X and the latest Crimson graphics driver v15.301.xxxx for R9 380 (or any other AMD eGPUs)? I'm not planing to use the internal retina display for gaming, so I think I'm not going to modify the driver files like this guy: http://www.remkoweijnen.nl/blog/2015/09/21/update-amd-display-driver-under-bootcamp/ to install the latest Crimson driver for my R9 M370X. Yeah the Nvidia cards are indeed better supported, I'm a CSGO gamer and the latest wildfire operation update just keeps crashing on AMD cards without any error messages, reported by AMD cards users including me (see more: https://www.reddit.com/r/AMDHelp/comments/46d193/counterstrike_global_offensive_operation_wildfire/). BUT AMD cards are usually more affordable!

Hello everyone! After reading tons of threads in this forum weeks ago, I finally decided to start my own eGPU project, thank you guys for sharing all the helpful instructions and explanations. But now I'm totally confused by choosing graphics card which will be used as my eGPU to work with my MacBook Pro, and I need some advice from you. Basics: I'm planing to build my eGPU within 500 € budget. I have a 2015 15" retina MacBook Pro with an AMD R9 M370X dGPU in it, under OS X this dGPU performs very well and gets the job done. But under Windows via Boot Camp for gaming, it's not powerful enough for me. My new eGPU will only be used under Windows, just for gaming in 1080p FHD at high/ultra settings. I only use an external monitor connected to my MacBook Pro at home, so if the built-in display won't work after plugging in eGPU, it dosen't matter, my MacBook Pro is in closed-clamshell mode anyway. Considering my tiny budget, I'm going to use an AKiTiO Thunder2 PCIe Box with a mid range desktop graphics card, and to power both of them without any potential problems, I'm going to use a single 500W desktop ATX PSU. Problems: Because the AKiTiO Thunder2 PCIe Box will cost me around 250 € including shipping (does anyone know where I can find cheaper offers for private customers in EU? ), and a good 500W ATX PSU will also charge me around 50 € at least, so only around 200 € left to buy a graphics card. At this price range I have two options: AMD Radeon R9 380 or Nvidia GeForce GTX 960, both have 2 GB of vRAM and both have ITX compact version to fit inside the AKiTiO chassis. Their performance is very close, R9 380 is a little more powerful than GTX 960 saying many benchmark results, but GTX 960 runs cooler and quieter than R9 380 and is also more power efficient. So let's leave their performance and benchmark scores alone, all I am thinking about and want to know is, how well would each of them work with my MacBook Pro? If I go pick R9 380, will I have a switchable graphics feature like Nvidia Optimus Technology from AMD? So that I won't have to disable and enable the dGPU manually, and the booting process would be very convenient to configure. The graphics drivers seem to be problematic, too. Because the official Boot Camp graphics driver for R9 M370X is half a year old and users are not allowed to install the newest driver from AMD website, also, the newest driver from AMD website says it doesn't support Boot Camp (see: http://support.amd.com/en-us/kb-articles/Pages/AMD-Radeon-Software-Crimson-Edition-16.1.1-Hotfix-Release-Notes.aspx). So there are going to be two versions of AMD graphics drivers exist alongside in my system, one for R9 M370X and one for R9 380, is that theoretical possible? If I go pick GTX 960, as I read others' instructions before, the booting process will be very painful? (see threads: https://www.techinferno.com/index.php?/forums/topic/8132-2015-15-mbp-r9-m370x-gtx97016gbps-tb2-akitio-thunder2-win81-gatsby/ and https://www.techinferno.com/index.php?/forums/topic/9386-2015-imac-5k-27-r9395x-late-2015-gtx980ti16gbps-tb2-akitio-thunder2-osx10113win10-mmomega/) And would there be any stable issues when I install two kinds of graphics drivers from two different manufacturers in my system? What do you guys think? AMD dGPU + AMD eGPU or AMD dGPU + Nvidia eGPU in my case? Any experience or advice would be appreciated! ---------- MacBook Pro with Retina Display, 15-inch mid 2015, Intel Core i7-4870HQ @ 2.5 GHz, 16 GB RAM, AMD R9 M370X with 2 GB vRAM / Intel Iris Pro Graphics, 512 GB Flash Storage Dell U2515H monitor, 2560 x 1440 @ 60 Hz OS X El Capitan v10.11.3 Windows 10 Pro (64-bit) v1511 via Boot Camp, UEFI