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May 31, 2016 11:44 AM in response to Jeff A.by Duane,★HelpfulYour iMac can support 2 daisy chained Thunderbolt displays. That Dell monitor supports DP 1.2 MST for daisy chaining two monitors.
After reading Using 4K displays and Ultra HD TVs with your Mac - Apple Support it doesn't look like your iMac would support 2 of those monitors. But I could be misinterpreting.