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It says:

"Dual-Cable Displays
Some displays with resolutions higher than 4K require two DisplayPort cables to connect the display at full resolution:
The Dell UP2715K 27-inch 5K display is supported by iMac (Retina 5K, 27-inch, Late 2014) and later"

So I need to connect 2 Thunderbolt cables between the iMac and the Dell Screen? Any specific Thunderbolt cable?
 
It says:

"Dual-Cable Displays
Some displays with resolutions higher than 4K require two DisplayPort cables to connect the display at full resolution:
The Dell UP2715K 27-inch 5K display is supported by iMac (Retina 5K, 27-inch, Late 2014) and later"

So I need to connect 2 Thunderbolt cables between the iMac and the Dell Screen? Any specific Thunderbolt cable?

Not thunderbolt cables, 2 mini display port cables, they are far cheaper than thunderbolt ones.
 
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Hi,

I would like to know if I can use the Dell UP2715K Monitor as a second screen to my 5K iMac and get on both 5K resolution at 60hz? How would I have to connect them?

Appreciate some info if you have.
Thank you

http://www1.la.dell.com/vi/en/corp/...?refid=dell-up2715k-monitor&cs=vicorp1&s=corp
Yes, but I think a secondary 4K monitor is a significant price and tech savings. But that 5K Dell monitor is supported by the iMac using both display ports to drive it. The Apple supported LG monitors do NOT work with the 2014 or 2015 5K iMacs surprisingly.
 
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