Sgt. Pepper

Dear goalque, I have both the MacBooks here, so if you can tell me how to read out the ioreg tree, i can upload both outputs so maybe we can really track this problem down Unfortunately i have no clue myself what i have to type into terminal etc

Also sry for the delay here, have been busy this week. I think your monitor is making the difference, because as far as i know your monitor is using SST-technology, while mine is MST-support only. At least this is the only reason for me why i cannot get it to work with 60Hz without MVC's hack (which then "deactivates" monitor output)...

Thats a pitty. I was hoping you could give me a hint where i could look for the "hidden component" and change it to make it work also with the eGPU. Concerning graphical artifacts, i would not bother as the web drivers right now show bugs in safari and preview in general. I think we have to wait for newer drivers in order to overcome these artifacts. @goalque: I'm sorry i obviously caused some confusion here: Concerning the HiDPI mode i just wanted to say that my GTX 970 is able to deliver the full resolution of 3840x2160 pixels that the Dell up2414q has as native resolution but can even put out resolutions as high as 3200x1800 HiDPI, which is equivalent to 6400x3200 pixels. The Intel Iris however is limited to 3840x2160 pixels, so every "higher" resolution (e.g. 2560x1440) is a non HiDPI resolution resulting in computing less pixels then the native resolution of the up2414q. The thing is just that i am limited to 30Hz with both GPUs or that my eGPU doesn't put out any video whilst the iGPU can then deliver the 60Hz. I think your Samsung monitor is indeed a SST model? My Dell is a MST model which makes me dependent of MST support in any driver, no matter if its apple's or Nvidia's. Also, i already tried all the drivers available from a fresh install of 10.10.1 as well as 10.10.2 ( every OS with their own drivers of course). So i fear i already did everything you advised me to do. So i think the basic question is: 1. Does Apple somehow block MST support of the nvidia web drivers in some of their kext? 2. Is it a problem limited to the new Maxwell series? Background: I was able to swap in an old (borrowed) GTX 260 (PC) inside the box today an everything worked with MVC's hack, meaning i was able to put out video to an old external screen over DVI whilst "AppleGraphicsDevicePolicy.kext" in "AppleGraphicsControl.kext" was modded. But as it is already supported in Appel's own drivers i was not dependent on the web drivers. Problem is this card could of course not drive the up2414q in any way so i cannot tell if it would have worked?

Yes, i have, it doesn't change anything to it i think it is not as simple as MVC described it in his tutorial when using an eGPU what i found out using the Macbook air is that its board id is not on this "blacklist" in AppleGraphicsControl.kext. maybe there is another location where i must add or remove the board id? - - - Updated - - - To be more clear: My problem is not that intel iris doesn't support more than 1920x1080HiDPI. I just do not understand why a intel HD4000 Macbook air with eGPU which is not certified at all by apple to drive something at 4k works so flawless but my rMBP is limited to 30 hz I read in some forums for mackintosh, for them MVCs tutorial worked just fine with a GTX 970, but this were all internal Do you know anything about why some cards work for accelerated graphics and some do not, i guess there has to be some kind of driver controlling the display output?

Hi everybody! First and foremost I want to thank everybody here on Techinferno, you guys made this possible to happen! I currently am using an eGPU Setup consisting of the Akitio Thunder2Pcie Box and the OcUK(Caseking) GTX970 „reference“. It was really painless to get this up and running, based on the things Tech Inferno Fan and goalque found out here. I really tried to read everything which has been discussed here in the "akitio thunder2pcie thread" but i couldn't find any information on my problem. But lets start with good things first: I'm running this on a late 2013 13"rMBP, OSx 10.10.2 with latest nvidia web driver 343.02.02f1 driving a Dell up2414q (4k MST) Monitor. everything works flawless so far. But no it comes to a point where i couldn't find a solution over the last week: 1. When the egpu is connected, i have all the beautiful pixels and even all the scaled HiDPI resolutions up to 3200x1800 HiDPI, so no problem. BUT I did not manage to get this display working at 60HZ. 2. I then found MVC's post here: http://forums.macrumors.com/showthread.php?t=1760435 I did it just as he described and now my MacBook can drive the up2414q at native resolution 4k@60hz. BUT my GTX 970 is no longer putting out video at all, although it is correctly recognized by OSX and performs well in e.g. OpenCL benchmarks. And as the Intel iris is not as powerful, i can no longer use HiDPI resolutions other than 1920*1080. The strange thing is, i was able to test this setup today with a 2011 MacbookAir and it worked exactly as it should, eGPU is detected, and works properly, giving me 4k@60hz AND resolutions up to 3200x1800 HiDPI. Maybe someone has a good idea or already got this combination working? Thanks a lot! If i get this working, i’ll make an implementation guide with pictures etc. - - - Updated - - - I can confirm this works without any problems