Will this allow me to expand my screen over two monitors?

Yes if you video card has a DVI-I, DVI-D, and HDM ports. You shouldn't have VGA any more except maybe on monitor side. Use DVI-I and HDM first then DVI-D. HDM to HDM end on monitor. DVI-I to DVI-I or VGA adapter to monitor. DVI-D to DVI-I end or VGA adapter to monitor. Vary few monitors I've seen have DVI-D connector on them.

Questions & Answers: StarTech.com DVIVGAYMM6 Black Connector A : 1 - 29 pin DVI-I (Dual Link) Male Connector B : 1 - 15 pin High Density D-Sub (VGA) Male Connector B : 1 - 25 pin DVI-D (Dual Link) Male Male to Male DVI-I

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StarTech.com DVIVGAYMM6 Black Connector A : 1 - 29 pin DVI-I (Dual Link) Male Connector B : 1 - 15 pin High Density D-Sub (VGA) Male Connector B : 1 - 25 pin DVI-D (Dual Link) Male Male to Male DVI-I Male to DVI-D Male and HD15 VGA Male Vid

Connect a DVI-D and a VGA Monitor simultaneously to a single DVI-I video source
6ft DVI to VGA
DVI to VGA Adapter
6ft DVI to VGA Cable
DVI to VGA Connector
DVI to VGA Converter
6 ft DVI-I Male to DVI-D Male and HD15 VGA Male Video Splitter Cable

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