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Yes, my Powercolor 280x running via Akitio is unstable. . 2013 MacBook Pro13" is support Windows 8 EFI.

I have powercolor 280x, It is work with akitio pcie box, but unstable(Freeze after few minutes in windows 8), I dont know what is the problem. I have another AMD Radeon HD 3450, It is fully work with akitio pcie box.. - - - Updated - - - I will order 4P PIN to DC 5.5 2.5MM to test Akitio 25W limitation. - - - Updated - - - Cant work on 2012 mid rMBP 15" with 650M, because 2012 mid rmbp cant fully support EFI windows 8 installation. When you install nvidia driver in EFI windows 8 will blue screen.........Maybe need DIY egpu 1.3 in bootcamp mode , But I cant succeed in this..

If you use EGPU, In windows 8 Cant find Iris pro gpu In device manager ,So cant use the internal LCD....... - - - Updated - - - Till now, powered riser is necessary, because original power adapter only 65W, EGPU need 75W from pcie. I will order 4P PIN to DC 5.5 2.5MM to test 25W limitation.

2014 Macbook Pro Retina 15" Iris GPU only model. AKITIO Thunderbolt PCIE Box. 2M Apple Thunderbolt cable. X16 toX16 riser with molex connector . Corsair RM550 PSU. MSI N760 2GD5/OC ITX. ATX Power switcher. Windows 8.1 EFI installation + Bootcamp driver. Very simple step: 1 All parts connect together. 2 Power on PSU (AKITIO Box power is supplied by X16 riser molex connector, No need original power adapter). 3 Power on Macbook pro. 4 Start windows. 5 Install driver 6 Well done. When you starting windows internal LCD auto off. Intel iris gpu auto power down when starting windows (Cant find iris 5200 in device manager). Restart windows no need power off PSU,Nothing to do, start windows egpu auto detect. 3dMark 11 P7233 X2749 Sorry for my poor english...

luffy889 Guys, maybe someone can help me: I just don't understand why I can see my video card in rEFIt shell using "pci -i -b" command (PCI 0A 00 00 device, in the end of the list), but windows 8.1 EFI just doesn't even list/recognize AMD Radeon R9 290 (tried 6770 too) as a device no matter what I try? Same Problem here........

Configuration Summary: Pre 2013 MacBook Pro - No plug and play - Figuring out a way to do a Bootcamp w/GPT install could then provide PnP over TB1 How to do a Bootcamp w/GPT installation???

gtx750ti power 60w, akitio pcie maximum power 25W, PSU is in need.