eGPU boxes and macOS 10.13

imacken

macrumors 65816
Original poster
Feb 28, 2010
1,232
121
Can someone please clarify for me the situation wrt eGPU boxes and macOS 10.13?
Am I right in thinking it is only Thunderbolt 3 devices that can utilise this? Does that mean restricted to the new iMacs and recent MBPs?
 

imacken

macrumors 65816
Original poster
Feb 28, 2010
1,232
121
What about things like the Akitio Thunder2? Would that work ok in a late 2015 iMac?
With the nVidia Pascal drivers released in beta recently, can a 1070 or 1080 be put into that and work ok with Thunderbolt 2?
Any issues there?
 

jcuecker

macrumors newbie
Sep 10, 2015
25
15
So, I could buy a 8Gb 580 for around £310 plus a Akitio Thunder2 for £260, plug it into my late 2015 27” iMac and I’d be good to go?
asfik this only works to drive an external display, not the iMacs retina screen
 

imacken

macrumors 65816
Original poster
Feb 28, 2010
1,232
121
Blurb for the Sonnet box (used in the Apple dev kit) says it can be for internal or external displays, although it only tends to mention notebooks, not iMac specifically.
I am however confused by something else. Look here and see that it states quite specifically that the Akitio Thunder2 is not compatible with graphics cards or Bootcamp!
sg.jpeg

[doublepost=1497775455][/doublepost]
asfik this only works to drive an external display, not the iMacs retina screen
Hmmm... maybe you're right!
http://appleinsider.com/articles/17/06/06/apple-egpu-dev-kit-requires-external-monitor-nothing-unique-about-graphics-card-or-enclosure
 

William_si

macrumors regular
Apr 4, 2016
188
53
Croatia
Not only maybe, 100% - there is no channel back into an iMac to feed the display on TB2, TB3 also only by extending protocols (as eg. the Razer blade does seemingly, not sure for new MBPs currently).
 

sickntired

macrumors member
Dec 9, 2012
50
4
I have a Razer Core with a Nvidia GTX 1080 Ti card in it that I connect to my Intel NUC Skull Canyon and it works well.

My question is that could I connect the new iMac to the Razer Core to drive an external display and will it work? Will the Nvidia card be a problem?
 

theitsage

Suspended
Aug 28, 2005
795
840
For internal display mode to work with an eGPU, the host computer has to have an integrate GPU. Apple disabled the iGPU in most iMacs. I've tried the 2017 iMac 4k and could not see the iGPU in neither macOS nor Windows 10 via Bootcamp. I could force the eGPU to accelerate the internal display through the use of a headless HDMI adapter. The performance loss is too much with this trick to be worth it.

https://egpu.io/forums/implementation-guides/mid-2017-imac-4k-gtx980ti40gbps-tb3-akitio-node-win10-theitsage/

mid-2017-imac-4k-21-inch-dual-egpu-windows-10.jpg
 
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