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USB-C to DisplayPort

Updated on 21-07-2023 in USB Type C
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2 on 20-07-2023

I need to get my Samsung LC34G55TWWRXEN to put out WQHD with 165Hz which it only does via DisplayPort. However both my laptop and my PS5 do not have a DisplayPort only HDMI and USB-C. What options do I have?

If I use HDMI on both ends the monitor can not do more than 100Hz. Will either HDMI to a DisplayPort or USB-C to DisplayPort work?

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Baak 0 on 21-07-2023

I think something like the below;

PS5 -> Samsung LC34G55TWWRXEN – CAC-1335 + CAC-2068

Laptop -> Samsung LC34G55TWWRXEN – CAC-1567 + CAC-2068 or CAC-1557 alone

Note that both setups are rated at 4K120Hz, getting 165Hz might not be possible.

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joevt 0 on 21-07-2023

4K120 requires 1076 MHz (CVT-RB2) or 1098 MHz (CVT-RB) or 1188 MHz (HDM).

WQHD is 2560×1440. 2560×1440@165Hz requires between 678 or 700 MHz.

Ultra WQHD is 3440×1440. The manual shows 165Hz is 879.714 MHz which is still less than 4K120.

The highest WQHD refresh rate shown in the manual is only 120Hz (for DisplayPort). I guess the display scaler can’t scale 2560×1440 165Hz to 3440×1440? I suppose you can test that with a custom timing.

In either case, the highest refresh rate for HDMI shown in the manual is 100Hz (410 MHz). HDMI 2.0 can do 8bpc 4:4:4 up to 600MHz and 10bpc 4:4:4 up to 480MHz so maybe a custom timing can do better than 100Hz? Chroma sub sampling can increase that further (if the display supports it).

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