Can I use 4k Dell P2715Q monitor with Thunderbolt 27" on the Retina MacBook Pro 13" (late 2013)? The Apple support website states:


  You can use 4K displays and Ultra HD TVs with these Mac computers:
  MacBook Pro (Retina, Late 2013) and later


However there is no mention about the type of MacBook Pro Retina, I mean between the 13" which has the Intel Iris Graphics and the 15" which has the Intel Iris Pro Graphics.

If it's not possible to connect both monitors in full resolution at the same time, is it possible at least to just connect a 4k like the Dell P2715Q in full resolution?
According to Apple, the 2011 and later MacBook Pro's can support up to two Thunderbolt Displays (2560x1440)

The Late 2013 MacBook Pro will support two external displays with a resolution of 2560x1600.

A 4K resolution is 3840x2160.

So, your MacBook will be able to drive both monitors, the Thunderbolt at full capability and the Dell at reduced resolution.  It won't be able to drive any monitor at 4K