Daisy chain Display Port (U2713H)

Hi Forum,
I have a rmbp 15 and 2 Dell U2713H screens that I usually connect to my macbook using both TB/DP ports.
Now I need to connect another TB device and looked into using the Daisy Chain option on the screens. Although I get image, it seems to be cloned and MacOS doesn't seem to know that the second screen is there.
My question is, how can I enable Daisy Chain on MacOS?
According to the specifications this should Work.
Device
connector
Device
Connector
Device
rMacbook Pro
miniDP to DP
Dell U2713H
DisplayPort 1.2 to DisplayPort 1.2
Dell U2713H
In theory this should work. Can anyone help me with this?
Thanks in advance,
Tiago

I am the OP.
Please see what I found on another thread that answered my question.
I just finished researching this for myself, as I was considering adding to my MacBook Pro (2012) a pair of new Dell U2713H 27" monitors that support DisplayPort-based daisy-chaining.
It looks like Thunderbolt-enabled Macs only support DisplayPort 1.1a which will not allow the kind of MST that you are looking for nor will it enable me to use multiple monitors as I desired. New Thunderbolt chips supporting DisplayPort 1.2 with MST are supposed to be available this year, and so would possibly make it into late-2013 or 2014 Macs.
It seems the only present ways to connect more than one external monitor to a MacBook are:
a) using a USB video adapter
b) purchasing two Apple Thunderbolt Displays
If someone releases a Thunderbolt docking station with multiple monitor outputs there might be hope, otherwise I think this won't ever be possible with current model MacBooks.

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http://support.apple.com/kb/ph11243
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Daisy chain Display Port (U2713H)

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