will this work with one 3440x1440 monitor and one 2560x1440 monitor? and will i be able to do over 60hz? they both do 100hz+

I'm fairly certain that you'd be pushing the limits of DisplayPort 1.2. Look at the total bandwidth being used of two monitors and if it exceeds roughly 24gbps, then the adapter won't handle it

I have my eyefinity 3 monitor setup and want to add a forth, can I use this adapter, and is it active?

Note that previous answers were from 2015. Current AMD Radeon driver software (post-Castalyst) does not support MST, and NVidia has an article on their site explicitly stating their drivers do not support MST either. MST will still work in mirrored mode when in the BIOS and on Windows boot logo, because despite AMD and NVidia not supporting MST in their drivers, they DO still build the hardware to handle all of DisplayPort 1.4's feature set.

What hz does this have with 2560x1440 monitors?

I have a 4 monitor setup, 2 of which go through the device. One at 3840x2160@30Hz, the other 1920x1080@60 Hz.

Why is this not using the whole screen. Why is there about 3 inches of my screen not being used.

We do apologize for any inconvenience. We would like to look into this with you. Please feel free to contact us at 1-800-265-1844. Our Technical Advisors are available 24 hours a day, 5 days a week to provide support. Atha, StarTech.com Support

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MSTDP123DP

Product ID: 9443358

Details

Color
Black
Compatible Devices
PC
Connector Type
DVI HDMI VGA
Item dimensions L x W x H
15.2 x 3.1 x
Specific Uses For Product
personal

⚡Plug & Play, no drivers

🔝Dual 4K @ 30Hz + 1080p @ 60Hz

🖥️3 DisplayPort outputs

VT28265

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Description

🚀 Triple your screen, triple your productivity!

IT PRO READY - Includes Windows Layout Utility to restore app positions, perfect for hot-desking and dynamic office setups.
EFFORTLESS SETUP - Zero driver hassle—just plug in and boost productivity instantly with native MST support.
CRYSTAL CLEAR VISUALS - Enjoy dual UHD 4K displays at 30Hz plus a 1080p monitor for stunning detail and smooth workflows.
ROCK SOLID CONNECTION - Latching DisplayPort connectors prevent accidental disconnects, keeping your workflow uninterrupted.
TRIPLE DISPLAY POWERHOUSE - Expand your Windows workstation with 3 simultaneous DisplayPort monitors for ultimate multitasking.

The StarTech.com 3-Port DisplayPort 1.2 Splitter is a Windows-only MST hub that enables connection of up to three DisplayPort monitors—two at 4K 30Hz and one at 1080p 60Hz—without requiring drivers. Designed for professionals seeking enhanced multitasking, it supports integrated and discrete GPUs, features secure latching connectors, and includes IT-friendly utilities to streamline multi-monitor management.

Specifications

ASIN	B00JLRBB8I
Best Sellers Rank	#73 in DVI-HDMI Adapters
Brand	StarTech.com
Built-In Media	Video splitter - 3 ports
Color	Black
Compatible Devices	PC
Connector Type	DVI, HDMI, VGA
Current Rating	1.2 A
Customer Reviews	4.0 4.0 out of 5 stars (1,274)
External Testing Certification	RoHS, CE, FCC
Finish	Hdmi
Global Trade Identification Number	00065030851886
Item Dimensions	15.2 x 3.1 x 0.8 inches
Item Type Name	Signal Splitter
Item Weight	3.52 ounces
Manufacturer	StarTech.com
Mfr Part Number	MSTDP123DP
Model Number	MSTDP123DP
Number of Items	1
Number of Ports	3
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	personal
UPC	065030851886
Unit Count	1 Count
Warranty Description	3 Year
Warranty Type	Extended

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