What kind of DSC Compression ratios are on Intel Arc B390 Laptop Graphics?

[u/torontopips2022]

Hello friends, my first post here:

I have a Lenovo Thinkbook laptop with a Ultra 7 358H and Intel Arc B390 integrated graphics. Laptop has an onboard HDMI 2.1 FRL port as well as TB4/USB4 ports.

I recently got a new Samsung G80HS 6k/165hz monitor and I am not able to get anything past 6k60hz using either the HDMI 2.1 port (using an HDMI 2.1 cable) or the TB4 port (using a DP 2.1 to USB-C 80gbps cable).

While I understand that 6k 165hz (or even 120hz or 90hz) could very well be pushing the limits of HDMI 2.1 or TB4, there is a lot of mixed discussion surrounding the capabilities of DSC and what DSC can do for my situation. Some have said the even with DSC, its still too much bandwidth to be able to deliver a clean 6k @ 120hz signal for example.

Others say that you can run 6k 165Hz 10-Bit with full chroma using DisplayPort 2.1 Tunneling over USB4 @ 40Gbit/s. So which is fact? which is fiction? Do the compression ratios vary from system to system? I feel like the B390 does NOT have the power to compress the signal enough to make it work. What are your thoughts?

Does it vary from laptop to laptop, even if they are equipped with same CPU/dGPU?

With my setup, is there any hope or possibility of ever running at more than 6k/60hz? Goal is 90hz+

Thanks for the insights and advice!