I have a late 2013 Imac 27 inch and I had a 30" Dell 3007wfp as my second monitor on the standard DVI adapter for a while at low resolution. I finally got off my behind and bought the mini displayport to dual-Link DVI Adapter... I was excited to see it in all it's glory. It immediately started flickering wildly and I thought I'd do some reading to see how I could resolve it. Pointers to making sure the adapter was version 1.03 didn't help.
http://support.apple.com/kb/ts3232
I already had it. I was getting ready to bite the bullet and just take it back when I decided to see if I had another DVI cable to swap the one I was using out "just in case". I found another one.. same length. Darn it. Then I noticed the DVI cable diameter I was using was significantly thinner than the one I found in my box of etc... What the heck? I thought.
Connected it and BOOM! Vivid colors, high resolution, no more flickers!! Issue gone. Happy days!
Thought I'd post this to possibly help the next schmoe who is in the same situation
