pizzacat

here are the basic steps:

reFit/apple_set_os.efi to enable Iris

gpu-switch (integrated.bat) to select the iGPU / reboot

install the iGPU drivers and run integrated.bat / shutdown

--

connect eGPU and boot

you should have 3 devices in Device Manager, with the eGPU showing an error icon

disable the dGPU in Device Manager and run integrated.bat / shutdown

boot with the eGPU connected, check Device Manager for 2 enabled GPUs

open Task Manager, there should be a constant 10-15% CPU load from the System process

Hibernate (a fix to remove the CPU load) 

Reboot and the CPU load will be gone, eGPU will work with Optimus!

How to shutdown (this is important!)

Enable dGPU in device manager

gpu-switch dedicated.bat

If you get a black screen on reboot, at any point, you probably used gpu-switch and selected a disabled GPU

reboot into windows safe mode to fix this

@p3nzancef1ier@tre87@maarten@juniordiscart@Morv@LukeHero

Here are the steps, I got it working, 

I finally got it working, Optimus + eGPU to power the dGPU Macbook internal display. 

There's a slight performance impact from using Optimus, but that's to be expected. 

On February 3, 2016 at 7:06 AM, Dschijn said:

Some people reported they got lucky with the latest driver in Windows 10.

Source?

Hi @goalque,

0.96 works quite well on my 750m/Iris 2014, but can install this without using the web drivers? thanks.

EDIT:

- Possible to use Nvidia official driver for Kepler cards [-skipdriver]

What about on a Maxwell card, a GTX 970?

Has anyone tried the new Nvidia 358.87 drivers?

They added this feature in Win10:

Here's the source of that image, if anyone's interested. Lots of TB3 specs included.

Just what I was looking for, thanks @rhx123

When TB3 devices are released, I assume they will be backwards compatible with legacy TB devices via an adapter cable? Considering they use a different hardware interface (USB3.1 vs mDP) what will the solution be?

@goalque

Avoid hot-plugging eGPU displays

Why's that?

I haven't had an opportunity to try them, but Intel just released new Windows 10 drivers for the Iris.

Has anyone got this working yet?

Just to confirm-

This is working on the new El Cap GM (15A282a) with WebDriver-346.03.01b07.

See my post

Hardware:

Macbook 11,3/2014/15" 750m

Gigabyte GeForce GTX 970 OC Mini-ITX (350.12 WHQL)

EVGA 400w PSU

AKiTiO Thunder2

Windows 8.1 UEFI

OSX 10.11 GM (15A282a) [thanks goalque!]

Molex > Barrel cable

24pin PSU power switch

Install eGPU on El Cap GM 15A282a:

Disable SIP

Download automate-eGPU

connect eGPU

cd to automate-eGPU and use -url to download and install WebDriver-346.03.01b07

in terminal:

sudo ./automate-eGPU.sh -url http://us.download.nvidia.com/tYGrxreBnE8b89jZ0VysebeSwZJehZTa/WebDriver-346.03.01b07.pkg

Restart

Optional: Install CUDA 7.0.64 drivers

Benchmarks:

over 9000. (Link)

Overclocking:

I used nvflash/maxwell bios tweaker to raise max temp target/power limit. The power limit is raised to a max of 175% but I really wouldn't recommend running it at that level.

Download nvflash + maxwell bios tweaker + 175% bios (GV-N970IXOC-4GD only!!!)

MSI Afterburner settings:

Surprisingly, the little card is very stable at these settings. Raising the memory clock to 8GHz introduces some artifacts however.

100% vs 140% Powerlimit (FurMark)

Big thanks to Tech Inferno Fan, goalque and the rest of the Tech|Inferno community!