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Club3D CSV-1585 resolution support

Updated 2 days ago in USB Graphics
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2 6 days ago

Why Club3D CSV-1585 doesn’t support minimum 4K resolution on my both displays, even I have the latest version USB-C, HDMI and DP -cable connected?

I’m using the displays in extended mode. The OS is Win11. My other Os is MacOs and seemingly MacOS doesn’t support extended mode, only mirror mode.

My main Display is Samsung c34j791 34″ with 3440 x 1440 pixels and secondary display is ACER K72HUL with max. 2560 x 1440 pixels.

Still CSV-1585 doesn’t give to secondary display more than 1920 x 1080 pixels, with any frequency! This is really annoying as the specification indicates minimum 4K resolution with 60Hz.

Anybody?

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joevt 0 5 days ago

What GPU are you using?

What refresh rates are you attempting for each display?

Do you know the pixel clock for the display modes of each display?

What color depth are you attempting for each display?

The CSV-1585 appears to be a DisplayPort 1.4 MST hub supporting HBR3 x2 with DSC for input and DSC decompression for output.

Does your GPU support DSC? With DSC support, the total pixel clock for both displays can approach 1080 MHz (assuming DSC@12bpp but DSC can compress down to 8bpp).

Without DSC support, the total pixel clock for both displays is limited to 540 MHz for 8bpc and 432 MHz for 10bpc.

Many MST hubs don’t support 10bpc decompression. In that case, you may need to select 8bpc (but HDR usually requires 10bpc).

The MHz numbers are maximums. DisplayPort MST overhead will reduce those.

An Intel Mac can use AllRez to get the DPCD info of the MST hub. There may be other methods to get DPCD info from Linux or Windows. The DPCD info will show most of the capabilities of the MST hub.

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Wiktor 0 2 days ago

Hi! 🙂
What is the refresh rate on the Samsung? Is it 60Hz or 100Hz?

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