Are you able to share the desktop across all monitors? Or does it simply duplicate the desktop to all monitors?

No this only splits the original signal four ways. If you want to have for monitors (desktops) you need to make sure that you get a pair of video cards that have dual output each or you may even find one that will split it 4 ways that you are looking to do. Just be careful because some cards say 4 monitor support but because of the type of connections they in reality support actually less.

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StarTech ST124HDMI2 HDMI Splitter 1 In 4 Out - 1080p - 4 Port -Mounting Brackets - 1.3 Audio - HDMI Multi Port - HDMI Audio Splitter

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Split an HDMI audio and video signal to four displays simultaneously
4 Port HDMI Splitter
High Speed HDMI Splitter
HDMI with Audio Splitter -HDMI Splitter 1080p -4 Port High Speed HDMI Video Splitter w/ Audio

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Split an HDMI audio and video signal to four displays simultaneously - 4 port hd

Model
Brand	StarTech.com
Model	ST124HDMI2

Details
Type	HDMI Switchers
Color	Black
Cable Length	No
Ports	4
Audio	Yes
Specifications	AV Cabling: HDMI Industry Standards HDMI 1.3, HDCP, EDID Color: Black Enclosure Type: Steel Dimension: 8.66" x 5.31" x 1.73" LED Indicators: 1 - Power (Green) / Input Signal (Blue) LED Indicators: 4 - Green Port signal indicator Supported Resolutions: 1080p (1920 x 1080) / VGA (640 x 480) / SXGA (1280 x 1024) / UXGA (1600 x 1200) / WUXGA (1920 x 1200) Wide Screen Supported: Yes Audio Support: Yes Maximum Cable Length: 16.4 ft [5 m] Input Current: 800mA Output Voltage: 12 DC Output Current: 1.5A Humidity: 0%~80% Operating Temperature: 0 degree C to 40 degrees C (32 degrees F to 104 degrees F) Storage Temperature: -20 degrees C to 60 degrees C (-4 degrees F to 140 degrees F) Power Adapter Included: Yes Input Voltage: 110 ~ 240 AC

Connectors
Input Connector	1 x 3.5 mm Stereo Female 1 x HDMI Female
Output Connector	4 x 3.5 mm Stereo Female 4 x HDMI Female

Performance
Maximum Resolutions	1920 x 1080

Features
Features	Splits a single HDMI source to up to 4 HDMI devices without signal loss Supports a wide range of PC and Supports HDTV resolutions from VGA to WUXGA and 480p to 1080p Passes DVI video signals, DVI to HDMI adapters/cables required - not included High Speed HDMI Compliant Supports video and audio Audio signal can be output through HDMI or using separate 3.5mm audio outputs Supports HDCP and EDID Cascade up to 3 layers LED Power/Active indicator for monitoring each port Quick and easy install

Dimensions & Weight
Weight	4.35

Additional Information
First Listed on Newegg	March 02, 2011

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Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return for refund within: 45 days
Return for replacement within: 1 year
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StarTech ST124HDMI2 HDMI Splitter 1 In 4 Out - 1080p - 4 Port -Mounting Brackets - 1.3 Audio - HDMI Multi Port - HDMI Audio Splitter

Learn more about the STARTECH ST124HDMI2

Customer Reviews of the STARTECH ST124HDMI2

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Warranty, Returns, And Additional Information

Warranty

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Manufacturer Contact Info

Item#: N82E16815158260

StarTech ST124HDMI2 HDMI Splitter 1 In 4 Out - 1080p - 4 Port -Mounting Brackets - 1.3 Audio - HDMI Multi Port - HDMI Audio Splitter

Learn more about the STARTECH ST124HDMI2

Customer Reviews of the STARTECH ST124HDMI2

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info