I've been trying to figure out how to get my ASUS Radeon hd 6870 to output 1080p on my insignia 32" hdtv. I know the tv supports 1080p because i can use it with my xbox 360 and ps3. I was also able to use 1080p resolution on my laptop with an nvidia geforce 9600m gt. One reason i think could be a problem is that i have to use a DVI-D to HDMI adapter because my tv does not have dvi input and the graphics card only has 2 dvi and 2 dp outputs. Currently i am only able to get 1080i resolution at 30hz, but i want 1080p at 60hz. CCC even says that my tv supports 1920 x 1080 at 75hz but will not give me that option. I have also tried to add the resolution through the HDTV support menu but when i check the box for 1080p at 60hz, it will not give me that option in the display settings.
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There is a display port to HDMI adaptor that you could try because the hdtv does have speakers and that may be the reason your not getting 1080p and display port does carry sound.