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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StarTech.com 3-Port DisplayPort 1.2 Splitter, DisplayPort to 3x DP Multi-Monitor Adapter, Dual 4K 30Hz and 1080p 60Hz Computer MST Hub, Windows Only (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

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Description

🚀 Triple your productivity with seamless 4K multi-monitor power!

IT PRO FRIENDLY - Includes Windows Layout Utility to restore app positions, perfect for hot-desking and dynamic workspaces.
EFFORTLESS SETUP - No drivers or software needed—just plug in and power up your multi-monitor productivity.
CRYSTAL CLEAR VISUALS - Enjoy dual UHD 4K displays at 30Hz plus a 1080p monitor for stunning detail and sharpness.
ROCK SOLID CONNECTION - Latching DisplayPort connectors prevent accidental disconnections during intense work sessions.
TRIPLE YOUR SCREEN REAL ESTATE - 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 maintain window layouts, making it an essential upgrade for modern office setups.

Specifications

ASIN	B00JLRBB8I
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 out of 5 stars 1,270 Reviews
External Testing Certification	RoHS, CE, FCC
Finish	Hdmi
Global Trade Identification Number	00027242881310, 00065030851886, 00650308518860, 00724627116912, 00724627256427, 00821594795246, 04058829180973, 05054484751373, 05054533751378, 07426101374377, 07426800529542
Item Dimensions	15.2 x 3.1 x 0.8 inches
Item Part Number	USM64GXW
Item Type Name	Signal Splitter
Item Weight	3.52 ounces
Item dimensions L x W x H	15.2 x 3.1 x 0.8 inches
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 027242881310
Unit Count	1 Count
Warranty Description	3 Year
Warranty Type	Extended

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NZ$222

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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