Top critical review
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absolutely does not support dual-link dvi
on January 30, 2015
*update* after some back and forth with gofanco, they realized they were mislabeling this product as dual-link since it did work on their dual-link monitor in hdmi 1.4 mode. I'm adding back two stars to reflect that my biggest problem was that it flat out claimed to be dual-link dvi and clearly was not, and they have fixed that. I am still returning them but glad they fixed their lisitng.
My previous one-star review:
This review is for the "gofanco® Mini DisplayPort to DVI Active Converter for 4K UltraHD DVI-D Dual Link Monitor". The title is a flat out lie. It does not in fact support dual-link DVI at all. I did not recieve a faulty unit. I tested it thoroughly with multiple operating systems, graphics cards, and displays.
It IS a functioning DisplayPort to DVI single-link adapter, and it is able to exceed the max frequency defined in the DVI spec. If you have a 4k HDMI1.4 device, and a dvi-to-hdmi adapter, this will work at 4k@30hz. If you have a 4k device that supports both HDMI 1.4 AND also has a dual-link displayport input, this will probably work - but so would a cheaper active miniDP to HDMI cable as well.
If you actually have a Dual-link DVI display, which based on the title, would seem to be the primary reason for purchasing this item, it will not work. Inside is a Parade Technologies PS171 chip which does not at all support dual-link DVI. I have two different displays that ONLY support dual-link DVI, and neither of them worked with this device and either a dual-link or single-link cable - meanwhile the 4k tv worked with EITHER the dual link or the single-link cable.
Instead of two 165mhz links, this device is only capable of using one single 340mhz link. This is useless for monitors that require two 165mhz links - the entire reason dual-link dvi was created in the first place.
I tried to confirm this with gofanco - no response at all from their tech support.
In short it earns the lowest possible rating, since the title is blatant false advertising, and i'll return it for failing to do the one job i bought it for.