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Question Updated to RX5700XT and new LG LG 34BL850 ultrawide. 6bit color vs 10 bit color

CuriousMike

Platinum Member
Feb 22, 2001
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Recently did a small upgrade for the home office / game machine and updated two pieces at once.

I have the monitor connected to the card over DisplayPort.

I was able to use the AMD software to create a custom profile that runs the display at 75hz.

However, when running at 75hz, the color depth drops to 6bpc and refuses to move to 8 or 10.

If I run at the default 60hz, I can select 10 bpc.

Is this a limitation of DP bandwidth, or other?
rad.png
 

Stuka87

Diamond Member
Dec 10, 2010
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If you had a standard 2,560 x 1,440 display, you could do 75Hz with 10bit color (thats the max for DP1.2). But it looks like you have an ultrawide, going off your screenshot. You can try messing with the subsampling, maybe use 4:2:2 or 4:2:0. This will use less bandwidth.
 

CuriousMike

Platinum Member
Feb 22, 2001
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I didn't know the cable made a difference. I'm using my original DP cable, I'll try using the supplied cable.
 

CuriousMike

Platinum Member
Feb 22, 2001
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419
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Well I used the supplied cable, and no difference.
Damnit.
The cable does seem thicker than my old cable.
I don't get it.
 

Stuka87

Diamond Member
Dec 10, 2010
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Looking at the monitor's specs, its only rated for 60Hz operation. Its quite possible the display cannot support more than 6bpc when you go over 60Hz. When you start to overclock a display, anything its rated for kind of goes out the window.
 
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CuriousMike

Platinum Member
Feb 22, 2001
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Right. I suppose if I was more of a gamer I would have prioritized refresh rate.
I'm happy enough with the display @60hz and full colors.

Thanks for your help.
 
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