REALLY... see that sounds very promising. apparently with the newer MBP's apple has made it very difficult to use eGPU's so what they give with thunderbolt port 2/3 in data rate transfer they taketh away with major hacking required to run. such a shame as this could be a potential market for 'plug and play' gaming or video/graphic rendering for people who already purchased a MBP or Mini but require more GPU power. Im sure a company once figured out could sell new solutions to the market for around £500/$750 (direct importing thunderbolt port/pcie parts, fitting into ATX module with PSU and Entry GPU). that allows the user to keep there small light MBP portable and then turn into a powerhouse when home and connected to a 4K monitor via a GTX 970 or equivalent.
GTX 970 - £220
PSU 300w - £40
ATX enclosure - £40
Import TB-PCIe kit - £80?
TB lead - £10
Total - £390 @cost??
The problem is, it's only seamless with certain enclosures and certain configurations of Macs.
Only Macs that support a UEFI Boot Camp installation (Haswell and later, and has to be at least Windows 8.1) will support an easy plug and play eGPU setup like mine (i.e. just install Windows via Boot Camp, install BC drivers, run Windows Update, prepare the hardware, connect TB cable to Mac, get to the boot manager by holding down Alt, power on the eGPU setup and select Windows. Then install the NVIDIA drivers. No need to muck about the software).
UEFI-compatible Macs:
MacBook Air (mid-2013 and later)
iMac (late-2013 and later)
Retina MacBook Pro (late-2013 and later)
Mac Pro (trashcan shape)
Mac Mini (late-2014 and later)
Long story short, only Macs with PCIe SSDs support UEFI. Non-retina MBPs, along with other Macs not listed above (basically all Ivy Bridge and older Macs), are not UEFI compatible.
As far as I know, the Sonnet IIID and Akitio Thunder2 box work seamlessly. You may have to go to the TechInferno forums for more details.
This was how I did mine:
http://forum.techinferno.com/diy-e-...0gbps-tb2-sonnet-echo-express-iii-d-win8.html
Also, if your Mac has a dGPU, you'll need an external display to be connected to the eGPU to work as well.