Does it support Mac? it only listed windows. Will further firmware update support Mac?

On the StarTech website it says that it supports Mac OS X 10.x, from Yosemite and up.

At 3840 x 2160 resolution is it running at 30hz or 60hz? Does it matter what internal on-board graphic chip set is?

Given the bandwidth limits of USB 3.0, even with DisplayLink's compression algorithm (that's the tech behind this product), it's unlikely you'll get 60HZ. I believe that your graphics chip is not important. This product uses your CPU to draw the extra display (so make sure to have a decent CPU).

Can this product be used to extend display from a PC to an older (2009) model 27"iMac?

i dought the mac driver is compatable.

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StarTech.com USB32DP4K USB 3.0 to 4K DisplayPort External Multi Monitor Graphics Adapter - DisplayLink Certified - USB 3.0 Video Card - Ultra HD 4K

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Connect an additional DisplayPort monitor to your PC with USB 3.0 technology capable of playback at 4K
Compatible with USB 3.0-enabled computer systems and 4K DisplayPort monitors
External Video Card / USB Video Adapter / 4k Video Card / 4k Support / Dual Display Video Adapter / USB Video Card
Add 4K capabilities to any USB 3.0 enabled computer system

Overview

Specs

Reviews

Connect an additional DisplayPort monitor to your PC with USB 3.0 technology capable of playback at 4K - Compatible with USB 3.0-enabled computer systems and 4K DisplayPort monitors - External Video Card / USB Video Adapter / 4k Video Card / 4k Support / Dual Display Video Adapter / USB Video Card - Add 4K capabilities to any USB 3.0 enabled computer system

Model
Brand	StarTech.com
Model	USB32DP4K

Details
Color	Black
Cable Length	No
Changer Type	USB to DP
Specifications	Maximum Resolution: 3840 x 2160 Host Interface: USB 3.0 DisplayPort: Yes Number of DisplayPort Outputs: 1 System Requirements: Operating System(s): Windows 8/8.1 (32/64bit) Windows 7 (32/64bit) Windows Vista (32/64) Windows XP (32/64) Windows 2000 (Aero 3D interface supported)

Connectors
Connector A	1x USB 3.0 male
Connector B	1x DisplayPort female

Features
Features	Connect an additional DisplayPort monitor to your PC with USB 3.0 technology capable of playback at 4K Compatible with USB 3.0-enabled computer systems and 4K DisplayPort monitors External Video Card / USB Video Adapter / 4k Video Card / 4k Support / Dual Display Video Adapter / USB Video Card Add 4K capabilities to any USB 3.0 enabled computer system

Dimensions & Weight
Dimensions	0.60" x 1.80" x 3.60" (H x W x L)
Weight	0.45

Package Contents
Package Contents	USB 3.0 to DisplayPort Video Card 1 x Software Installation Disc 1 x Instruction Manual

Additional Information
First Listed on Newegg	November 21, 2014

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Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.

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StarTech.com USB32DP4K USB 3.0 to 4K DisplayPort External Multi Monitor Graphics Adapter - DisplayLink Certified - USB 3.0 Video Card - Ultra HD 4K

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Manufacturer Contact Info

Item#: N82E16812400600

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StarTech.com USB32DP4K USB 3.0 to 4K DisplayPort External Multi Monitor Graphics Adapter - DisplayLink Certified - USB 3.0 Video Card - Ultra HD 4K

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Warranty & Returns

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Manufacturer Contact Info