Triple 5k iMac setup
Can I use two 5K iMac as a external display for my main 5k iMac if I set the resolution at 2560x1440 using Apple's display-port cable, I want to make sure this works before I buy two more 5k iMac's.
Hi Darrell
No - that will not work.
Neither iMac (Retina 5K, 27-inch, Late 2014) nor iMac (Retina 5k, 27-inch, Mid 2015) can be used as displays for another iMac (which is referred to as "Target Display Mode"):
Use your iMac as a display with Target Display Mode - Apple Support