Sharp LC-43UB30U 43" 4K tv and Radeon 6950 Crossfire

[ToastyX]

(10-16-2015 02:21 PM)silent-circuit Wrote:  First question is, is there any reason I'd be better off using a straight HDMI cable, from the card's HDMI port to the TV? I figured since the card is HDMI 1.4 and everything I read says you need 2.0 to get 3840x2160 I would be better using the DVI port and the adapter, but maybe I'm wrong there?

6000-series cards don't even support HDMI 1.4. You need HDMI 1.4 to get 3840x2160 @ 30 Hz and HDMI 2.0 to get 3840x2160 @ 60 Hz. 6000-series cards won't do 3840x2160 @ 30 Hz without the pixel clock patch.

HDMI is electrically equivalent to single-link DVI. Using an adapter won't help. The HDMI port might handle higher pixel clocks better than the DVI ports.

(10-16-2015 02:21 PM)silent-circuit Wrote:  Is there any way around this limitation? I was under the (apparently mistaken) impression that the pixel clock patch would fix it.

The pixel clock patch allowed you to get 3840x2160 @ 30 Hz. You will not be able to get 3840x2160 @ 60 Hz with 4:4:4 chroma.

It might be possible to get 3840x2160 @ 60 Hz with 4:2:0 subsampling, but I don't know if this works with 6000-series cards. Use CRU to edit a custom extension block. Add a TV resolutions data block, and set the "4:2:0 resolutions" option. Then add 3840x2160 @ 60 Hz in there. Make sure to add an HDMI support data block as well.

(10-16-2015 02:21 PM)silent-circuit Wrote:  Will I have to get a new GPU if I go to a 4K display, or do you think it's an issue with this model of TV specifically?

You definitely need a newer GPU to get 3840x2160 @ 60 Hz with HDMI, but I'm not sure if any GPUs support HDMI 2.0 yet.