DisplayPort 1.2 MST (Daisy Chaining) on 2013 MacBook Pros

Hi,
If I am not wrong, 2013 MacBook Pros support DisplayPort 1.2, and according to Wikipedia one of the features added in 1.2 is daisy chaining (emphasis mine):
DisplayPort version 1.2 was approved on December 22, 2009. The most significant improvement of the new version is the doubling of the effective bandwidth to 17.28 Gbit/s in High Bit Rate 2 (HBR2) mode, which allows increased resolutions, higher refresh rates, and greater color depth. Other improvements include multiple independent video streams (daisy-chain connection with multiple monitors) called Multi-Stream Transport, facilities for stereoscopic 3D, increased AUX channel bandwidth (from 1 Mbit/s to 720 Mbit/s), more color spaces including xvYCC, scRGB and Adobe RGB 1998, and Global Time Code (GTC) for sub 1 µs audio/video synchronisation. Also Apple Inc.'s Mini DisplayPort connector, which is much smaller and designed for laptop computers and other small devices, is compatible with the new standard.
However, on OS X Mavericks, daisy chaining is only supported for Thunderbolt displays and not displays that support DisplayPort 1.2, such as Dell U2713H.
Is this a limitation of the hardware, or is this a feature that's not supported by Mavericks's DisplayPort drivers and could potentially be supported by Yosemite?
Thanks.

Daisy chain Dell u2713h
Covered in another thread. Short version, Apple hasn't enabled support for it. If you run Windows it works great!. No support in Yosemite either.

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