That works only on older cards which have DVI-I outputs. There are no pins where to connect those resistors in DVI-D connector of R9 290 because it is digital only.

Hi, I'm the guy who sold that dummy plug from the link. It was one of the first dummy plugs I made for myself and just sold one remaining to see if it goes. Then I made 30 more DVI-D and 20 HDMI plugs with more serious construction and sold them in less than a week with no more parts left. Now I received a LOT more parts and factory made PCBs so I can make much more of them. Ebay link to HDMI plugs I make: http://www.ebay.com/itm/161256879194?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649 (you can look into my account on ebay UK if you want to pay in British pounds). I sell DVI-D ones too. But personally, I like HDMI plugs much more as they are a lot smaller and better construction. Basically both types are the same except the connector used and board layout. If you are interested you can buy them on ebay or PM me here.