does this support 1920x1080 at 144hz?

I haven't tested it. It should work: Displayport 1.2 has a maximum theoretical bandwidth of 17.28 Gbits/sec. 1920 x 1080 @ 8bits/pixel and @ 144hz should be 8.56 Gbits/sec. So it should work if the videocard and display are both capable. All the pieces (drivers->video card->cable->monitor) need to support it.

Is this 1.1 or 1.2 for the DisplayPort version (does it support audio)?

Good question not using it for audio. I am just using it to run a second high res. monitor.

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StarTech.com MDP2DPMM3 3 ft Mini DisplayPort to DisplayPort 1.2 Adapter Cable M/M - DisplayPort 4k with HBR2 support - 3 feet Mini DP to DP Cable

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Connects Mac and some PC laptops with mini DisplayPort connections
Male 20-pin mini DisplayPort to male 20-pin DisplayPort outputs
Maximum resolution of 4Kx2K (3840x2160)
Allows flexibility with older Macs and PCs
Supports connections to DisplayPort-enabled 4K televisions, projectors and monitors

Overview

Specs

Reviews (101)

Create a high-resolution 4k x 2k connection with HBR2 support between your Mini

Model
Brand	StarTech.com
Model	MDP2DPMM3

Details
Type	DisplayPort Cable
Cable Length	3 ft.
Connector Number	2
Connector Detail	Connector A: 1 - Mini DisplayPort Male Connector B: 1 - DisplayPort Male

Features
Features	Latching DisplayPort connector prevents accidental disconnection Backed by a StarTech.com lifetime warranty and free technical support Compatible with Apple mini DisplayPort equipped computers

Additional Information
Date First Available	September 22, 2010

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Warranty Notice:
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StarTech.com MDP2DPMM3 3 ft Mini DisplayPort to DisplayPort 1.2 Adapter Cable M/M - DisplayPort 4k with HBR2 support - 3 feet Mini DP to DP Cable

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Item#: N82E16815158227

StarTech.com MDP2DPMM3 3 ft Mini DisplayPort to DisplayPort 1.2 Adapter Cable M/M - DisplayPort 4k with HBR2 support - 3 feet Mini DP to DP Cable

Learn more about the STARTECH MDP2DPMM3

Customer Reviews of the STARTECH MDP2DPMM3

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies*

Manufacturer Contact Info