SO let me get one thing straight...I currently have 2 external monitors daisy chained via the mini display port. It is my understanding that the GPU on the i5/256 only allows 3 monitors ( 2 external and one being the sp3)..I saw the video of someone connecting 4 monitors and the SP3 via USB 3.0. So I was going to get the UD-3900 and connect my other 2 monitors for a total of 4 external and the SP3. Can I do this configuration ( both the nini display port and the USB connected monitos Im confused because it says I can only connect 2 external monitors and then I see the video with some guy connecting 4 external monitors so I wanted the both of best worlds...BUt my IT guy at work says it doesn't matter the interface, Im limited to 2 external and one sp3...doesn't matter if its mini DP or USB 3.0..you can only connect up to 2 external...is he right?
From the Pluggable site :
DisplayLink’s Windows drivers make use of the main GPU for rendering, and require an Intel, nVidia, ATI/AMD primary graphics driver supporting WDDM to be installed.
USB graphics devices, like the UD-3900, are “virtual” devices where much of the heavy lifting is done by the CPU, by hooking into the graphics stack. The DirectX APIs used by games assume direct hardware access (a PCIe graphics card). DisplayLink’s drivers attempt to emulate as much of the functionality as possible, which is why some 3D functionality (like that needed for desktop and apps) works.
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Different USB graphics drivers types (DisplayLink, MCT/Tritton, SMSC, Fresco) are not compatible on the same system. In particular, some versions of MCT drivers will bluescreen when other USB graphics drivers are also present.
So if it uses the main GPU id say your limited to two external displays with this.
I seems like some other *compatible* USB device would be needed that includes its own GPU to drive the extra 2 displays.