[Solved] 2009 27" iMac as external display?
Does anyone know if its possible to use a 2009 27″ iMac with Target Display Mode as an external display for an egpu setup on my macbook pro? I was planning on connecting a displayport to mini displayport from my gpu to my imac and running it in Target display mode. Will it work though?
In theory your proposed plan should work. Give it a shot and let us know what happens.
Thank you for the update, @darth_raider! This is very cool and funny to see.
Just chiming in with another success story. I was able to successfully get Target Display Mode in the following setup:
Note that according to Apple's support article, iMacs from 2011-2014 require a Thunderbolt connection, not a DisplayPort connection, meaning this may be limited to a pretty narrow range of target iMacs.
The only thing not working as (possibly?) expected is that the iMac's built-in speakers can no longer be targeted by my MBP. I was previously doing this successfully on Thunderbolt3-to-DisplayPort without an eGPU in-between, so small bummer, but I'm ok with it.
great! I was thinking of this idea then came here to see you've proved it works.
Why buy an external monitor (a dell 23.8 QUHD - 2K) for the egpu setup when it'll work with a 27" imac?
this is my future setup:
mid-2014 15" macbook pro (tb2 to tb3 adapter)
sonnet egfx with RX 580 8Gb
one of these as external monitors: 2009/2010/2011/2012 27" iMac
does anyone know what is the frame rate/refresh rate of them so I'll know how it should work in comparison to using the dell display in terms of performance?
MBPr Mid 2014, dGPU: Nvidia750M ■ Sonnet eGFX 350 ■ AMD RX 580 8gb ■ TB3-TB2 adapter ■ Dell U2518d ■ high sierra 10.13.5
I'm trying to use Target Display Mode with an old 2009 iMac and my eGPU, but I'm having no luck. I've seen this old thread where someone says they've got this working, but when I try to connect mine, it does nothing at all.
When I use a Mini Display Port to Thunderbolt 3 cable plugged directly into the MBP, I can use the iMac in Target Display Mode, but I run into trouble with the laptop overheating so I want to try with the eGPU (which I'd originally bought to use with an older computer).
When I use a Mini Display Port to HDMI cable plugged into the graphics card, however, the iMac does nothing—it just carries on being an iMac. Do I need to use MDP to Display Port? Is there anything I can do to debug this and work out where the problem might be?