Can I run an additional 4k monitor off the 5k iMac?

macmee

Suspended
Original poster
Dec 13, 2008
835
1,089
Canada
I have a macbook pro 2014 that's powering my 4k monitor, but it's sort of laggy.

So, I'm eyeing this new iMac with 5k.

I only want it, however, if it can support both the built in 5k monitor and an external 4k monitor (DP 1.2) without lag.
 

WinstonRumfoord

macrumors 6502
Mar 27, 2014
452
1,116
I have a macbook pro 2014 that's powering my 4k monitor, but it's sort of laggy.

So, I'm eyeing this new iMac with 5k.

I only want it, however, if it can support both the built in 5k monitor and an external 4k monitor (DP 1.2) without lag.
at 60hz?
 

theSeb

macrumors 604
Aug 10, 2010
6,963
83
Poole, England
Although "without lag" is subjective ;)

----------

Yes, this is possible

Apple support pages said:
MacBook Pro (Retina, 15-inch, Late 2013, Mac Pro (Late 2013), and iMac (Retina 5K, 27-inch, Late 2014) computers also support multi-stream transport (MST) displays at 60 Hz.

If you use a 60Hz MST display with the MacBook Pro (Retina, 15-inch, Late 2013) or iMac (Retina 5K, 27-inch, Late 2014), only one additional Thunderbolt display can be supported. See Thunderbolt ports and displays: Frequently asked questions (FAQ) for more information on Thunderbolt displays.

You need to manually configure 4K displays to use MST.
http://support.apple.com/kb/ht6008
 

EnderTW

macrumors 6502a
Jun 30, 2007
505
13
Although "without lag" is subjective ;)

----------



Yes, this is possible



http://support.apple.com/kb/ht6008
Wow Nice find!

As with OP, I'm surprised they updated this page quickly.

iMac driving 9k ! (5k + 4k screen) whew.. I have the 4k Dell, going to test this to see if it's smooth. I won't be editing 4k video or anything like that. I get my iMac on Friday, I'll let you folks know how the performance is.