Originally Posted by Spongeworthy
I guess that answers it, I'm using a 7970, HDMI 1.4A supports up to 4k, is it just a limitation of the cables/adapter?
It's a limitation of the DVI spec - a dual link DVI signal is electrically different from an HDMI signal of the same bandwidth. This is a hard limit. HDMI 1.4 cannot be converted into DL-DVI without some fancy converters, which may or may not even exist.
And I doubt your monitor can handle HDMI 1.4A. But that's just my thoughts.
The whole point of this is to use HDMI so I can set custom resolutions of up to 4K for downsampling which I can't do through DVI since the max resolution is 1600p.
Errr... Get your video card to do it. It does downsampling better than the monitor ever could anyways. I don't know if drivers nowadays support it, but you're essentially talking about a super-sampling anti-aliasing mode. And it doesn't involve any fancy requirements on your cables.