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I guess I'm going to try the UEFI route since the wiring reset method didn't work. I hear UEFI is problematic on a MBPr 2012 though and that only 2013 MBAs have native EFI 2.0. Do you have a recommendation for a guide to doing it on my machine?

I didn't label it wrong and I have some soldering experience so I don't think that's the problem. I'll try voltmetering it but I suspect I may have to try a UEFI install. Can that work on a MacBook off of an external USB drive? Otherwise I might test it on my MacBook Air as doing a clean install isn't an option on my main MacBook Pro Retina atm.

Found the reset menu option in Setup 1.3. Resetting didn't make it detect. Thanks for helping me figure this out Nando and Arise. I'm a bit confused though. Is Refind a possible way to diagnose anything?

Thanks, trying that now. How exactly should I be soft rebooting from within DIY EGPU? Hitting power on the MBPr keyboard?

RE: http://forum.techinferno.com/implementation-guides/6689-%5Bguide%5D-2013-15-macbook-pro-gtx780ti%4016gbps-tb2-sonnet-echo-express-iii-d-win8.html#post91182 Hi Squinks, I attempted to follow your advice and get a Sonnet Echo SEL. an EVGA GTX 780 and an Antech PV550 PSU with a riser cable between the SEL and the GTX. It didn't work, so more research indicated that I needed to install EGPU software as my 2012 MBP Retina doesn't support plug and play. Still nothing is detected. Then I found that the Sonney Echo doesn't support PCI Reset Delay somehow, and powers the card the moment it is plugged into Thunderbolt. So there was a cable wiring guide supplied by Arise: http://forum.techinferno.com/diy-e-gpu-guides/4570-%5Bguide%5D-2012-13-macbook-pro-retina-gtx660%4010gbps-tb1-sonnet-ee-se-win7-8-a-3.html I took the plunge and soldered an ATX cable to the PCIe cable to prevent the Sonnet card slot from prematurely powering it so it relies entirely on the PSU for power. I've followed various sequences of turning things on and no luck yet. I wondered if you have any advice or if you had to do any of the soldering mentioned for the PCI Reset Delay since you didn't mention it in your guide to the III-D. Your article inspired me and probably many others to try this finally, and I hope I can figure out what troubles my config has to help avoid this pain for others. Also I want to see my computer go fast!

Just tried that. Sonnet connected to start. When Windows bootloader menu appears, I turn on PSU and card fans spin up. After three seconds I hit down and return to use EGPU Setup. Not detected.

Tried that a few times and no luck still. I was excited that I managed to freeze it by plugging in Thunderbolt after 3 seconds from the PSU power-on but before it was done clearing the boot drive selection screen. At least freezing is different from what usually happens: Boots fine but no display adapter detected.

So Sonnet SEL AC connected, Thunderbolt not connected to Mac yet. PSU off. Boot Mac holding option. When drives appear, release option. Power on PSU (while thunderbolt isnt connected yet). Wait 3 seconds. Hit return to boot Windows. Plug in thunderbolt to Mac before bootloader appears. Look for video card detected. Is that the right sequence? I'll try it.

EVGA GTX 780. The fans spin up when I hit the power button on the PSU which is giving it all its power via the 6 and 8 pins and the ATX-PCIe spliced wires that would otherwise be powered by the Sonnet slot. Here's a picture: Is it a problem that the ATX PSU cable I spliced is a 20-24 pin with some of its wires coming out as splits from the 20 connected to to the PSU? I couldn't find any colored 24-24 pin cables at Fry's only the all red kind which would be tricky to keep organized.

It didn't work. I have yet to see it detected by EGPU Setup or Windows Device Manager Display Adapters. I soldered the ATX PSU to PCIE riser cable as instructed and that keeps the card from spinning up its fans when the Sonnet Echo SEL is plugged in and turned on. I boot with option held, wait for drives to apepar, turn on the 550W Antec VP550 PSU plugged into the 6 and 8 pin connectors on the GTX 780, wait 3 seconds, release option and hit return, I get asked to boot Windows or EGPU Setup. If I pick EGPU setup, it can't see it and compaction hangs. If I pick Windows, Device Manager doesn't show anything except the internal 650m dgpu. I've done all the things, what do I do now?

Okay thanks for the pictures and updated diagram. I just finished soldering it together and I'll give it a try. I recorded some video clips that could help illustrate it for others in future.

http://forum.techinferno.com/diy-e-gpu-projects/4570-%5Bguide%5D-2012-13-rmbp-gtx660-sonnet-echo-express-se-%40-10gbps.html#post63754 According to that guide, the Echo boxes require splicing up the cable to prevent the slot from providing power and to only allow power to come from the PSU because the Echo lacks some kind of power timer delay. This is a little intimidating. Can anyone confirm if this is necessary to get the Sonnet Echo SEL working? Also I saw guide pictures but it would be AWESOME if someone could record a video of how this is done.

I'm attempting this now. So far, none of the sequences for turning it off till holding option then turning it on as it starts Windows have worked for me. Always I see in Device Manager no Display Adapters other than the internal 650M. Does anyone have advice? I paid Tech Inferno Fan to get the DIY EGPU Setup 1.3. The guides I saw about plug and play said that it required a 2013 MacBook, so it sounds like I'll need the EGPU Setup but the instructions in this thread original post sounded like the GPU should be at least detected before running EGPU software. What do you think? Thanks to Tech Inferno Fan and everyone providing guides, I hope I can figure this out and add another data point about a config based on what is surely going to be a popular setup for those who want a TB2 enclosure cheaply like the Sonnet SEL. (I'll have to upgrade to a Broadwell MBA or MBP with TB2 when they come out around Christmas).