RTX4090 and Apple Studio Display?

[Saeven]

Hey!

I primarily use a Mac Studio, but also have a PC that I use to test software. Checking around, I found some videos explaining that I could use the Apple Studio Display providing I had the right cable and installed some drivers through Brigadier (https://nadim.computer/posts/2023-07-22-studiodisplay.html).

PC side is DisplayPort straight into an RTX4090.

This is the cable I am using:

Cable Matters USB C to DisplayPort 1.4 Cable 10 ft, Support 8K@60Hz, 4K@240Hz (Thunderbolt 4 to DisplayPort Cable, DisplayPort to USB C Cable) Black - Not for Portable USB-C Monitor

The Cable Matters USB Type-C to DisplayPort Cable supports the newest release computers and smartphones with USB-C or Thunderbolt 3 up to 4K 60Hz UHD display monitors with DisplayPort. Experience the vibrant video and authentic audio supported by monitors with DisplayPort for gaming, video s...

www.amazon.ca

Unfortunately, I'm getting some crazy flicker (it's fine on MacOS). Anyone experienced and solved this?

Video of flickering:

Thanks!

 

[joevt]

Seems like a bad cable with too much noise. 6ft might be better than 10ft. The display uses DSC, which means the GPU is sending compressed data. Errors in compressed data cause larger artifacts on the screen because decompressed data depends on earlier data being correct. The data is divided into slices, so you see that the corruption occurs in quarter vertical slices of the display.

Consider a cable that includes USB data, so that you can use the USB features of the display, such as audio, external USB ports, and brightness control.
https://dancharblog.wordpress.com/2020/07/20/add-usb-c-with-dp-alt-mode-to-your-desktop-pc/

 

[Saeven]

Thanks @joevt

I'd gone ahead and bought one of those cables with USB-data; unfortunately it still flickers just the same.

 

[mi7chy]

Have you confirmed with a known compatible monitor that the 4090 works without artifacting? Perhaps perform a GPU memory test with MODS v520.112.

 

[joevt]

Do all outputs of the 4090 have the same problem?

Maybe there's a way to cleanup the DisplayPort signal.

If you had a Thunderbolt add-in card, you could pipe the DisplayPort from the 4090 into the add-in card and use a USB-C cable from the Thunderbolt port. Maybe the add-in card could improve the signal?

Or perhaps the Sunix UPA2015 although I don't know if that one buffers the DisplayPort input.
https://dancharblog.wordpress.com/2020/07/20/add-usb-c-with-dp-alt-mode-to-your-desktop-pc/

Maybe a DisplayPort 1.4 MST hub?