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Can one GPU output 60Hz over HDMI and 120Hz over DVI simultaneously?

Last response: in Graphics & Displays
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November 1, 2013 12:09:35 PM

I have a Radeon 7850 that is simultaneously outputting to HDMI and DVI (the HDMI goes to my receiver with audio over hdmi and the dvi goes straight to my monitor). I am considering upgrading my monitor to the BenQ XL2420TE and would like to make use of the 120Hz refresh rate. Since HDMI doesn't have the bandwidth for 1080@120Hz, I know I won't be able to use hdmi at 120Hz. But DVI does support it and I would like to use it. But that would mean that I would need to be outputting at two different refresh rates simultaneously. Is this possible? Thanks!
a b À AMD
a c 103 U Graphics card
a b C Monitor
November 1, 2013 12:15:49 PM

sengin said:
I have a Radeon 7850 that is simultaneously outputting to HDMI and DVI (the HDMI goes to my receiver with audio over hdmi and the dvi goes straight to my monitor). I am considering upgrading my monitor to the BenQ XL2420TE and would like to make use of the 120Hz refresh rate. Since HDMI doesn't have the bandwidth for 1080@120Hz, I know I won't be able to use hdmi at 120Hz. But DVI does support it and I would like to use it. But that would mean that I would need to be outputting at two different refresh rates simultaneously. Is this possible? Thanks!


Yes it is possible. AMD Radeon GPUs have two pixel clock generators. This allows for two displays to be used simultaneously, or more than two if DisplayPort multiplexing is used

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a b À AMD
a c 103 U Graphics card
a b C Monitor
November 1, 2013 12:15:52 PM
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sengin said:
I have a Radeon 7850 that is simultaneously outputting to HDMI and DVI (the HDMI goes to my receiver with audio over hdmi and the dvi goes straight to my monitor). I am considering upgrading my monitor to the BenQ XL2420TE and would like to make use of the 120Hz refresh rate. Since HDMI doesn't have the bandwidth for 1080@120Hz, I know I won't be able to use hdmi at 120Hz. But DVI does support it and I would like to use it. But that would mean that I would need to be outputting at two different refresh rates simultaneously. Is this possible? Thanks!


Yes it is possible. AMD Radeon GPUs have two pixel clock generators. This allows for two displays to be used simultaneously, or more than two if DisplayPort multiplexing is used
November 1, 2013 1:16:13 PM

Awesome! Thanks so much, Pinhedd (and for the why it will work as well, I'm always interested in the details).
!