Can't use 2nd monitor for Desktop Video - DisplayPort issue?

I just got my Mac Pro 8 core (2009). I have two monitors connected to it. Anything that happens on the second monitor(connected to the DisplayPort via a DisplayPort to DVI adapter) is choppy. I can't even move or reposition windows smoothly.
Additionally, Final Cut Pro will not let me use the second monitor to play my video out as I could with my previous mac pro (2008) which had two DVD ports.
What's up with this DisplayPort causing these issues?

Hi,
If you can't see the basic HP UEFI boot menu information with a DVI connection then you have a hardware issue. It's either your monitors or DVI cable or the DVI port on your PC. It's definitely not a software issue as digital drivers don't get loaded until later in the Windows boot process.
Test the monitors and the DVI cable on another PC to ensure that they work correctly. Alternatively, try a different DVI cable and monitor on your PC.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
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Windows 7/8 UEFI/Legacy mode, MBR/GPT

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