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This review is from: VisionTek 900639 DisplayPort to Dual Link DVI-D Active Adapter Cable
Pros: Inexpensive, no external power needed
Cons: Could only do single link 1280x800 on my dual link 2560x1600 HP LP3065 display.
Other Thoughts: I bought this because a review at another site indicated that this dongle worked most of the time with a Hewlett-Packard LP3065 display, which is what I have. That HP display accepts only two video modes: 1280x800 single link DVI and 2560x1600 dual link. This adapter was only able to drive my display at 1280x800, although it did pass through the EDID video mode description for both 1280x800 and 2560x1600. When I tell my computer to set the video mode to 2560x1600 on the DisplayPort interface, my LP3065 just displays a black screen and turns the LED at the bottom of the screen yellow, which I think indicates that it thinks it is receiving an invalid video mode.
In case the video signal generation might be an issue, I'll mention that I connected this adapter to the DisplayPort output of my MSI b85m-g43 motherboard with an Intel i7-4770k processor. The computer was running
There is another review here from a person who claims to have gotten this dongle to drive an LP3065 with tolerably sporadic problems. So, what's different about my configuration?
Firstly, I'm embarassed to say I I did not buy from NewEgg. Perhaps NewEgg is selling a newer or at least better revision of the same product. I am, however, confident that this is not a case of the wrong part being shipped, because the dongle has "VisionTek, "Dual Link" and "Active" painted on one side of it, and has a small bar code label on the back marked "VT 900639".
Secondly, perhaps there is problem arising from the output driving the dongle. I am using the DIsplayPort on my MSI b85m-g43 motherboard, running Linux and X-windows with an open source Intel video driver ("xf86-video-intel") on a Linux-3.13.0 kernel. This computer was also driving a 39" Seiki from its HDMI port at 3840x2160 at 30 frames per second, although I had the same problems when the second monitor was only being driven at 1920x1080x30fps from before the dongle was plugged in through my testing the dongle at 1280x800 and 2560x1600. So, I don't think I was somehow out of video bandwidth.