Hi Lensmann,

What DisplayPort cable do you use with the CAC-1331 and your Dell P2715Q? (Which version)

Not sure what you mean with “533MHz pixel clock/timing” . 

I don’t know if you can lower the color bitrate output from the PS5 to 8bits maybe?

Hi Baak,

I’ve tried four different DP cables, varying from 0.5m to 3m in length. They have all been confirmed to be working at 4K@60Hz on both my MacBook Pro and my PC using an AMD RX 580 GPU. 

If I understand it correctly, there aren’t really different versions on DP cables – a DP cable is a DP cable. I can however confirm that at least two of the cables claim to be “DP 1.2” capable in their product descriptions. Do you think this could be a DP cable issue? I could try to acquire a different cable, perhaps one on the Certified list on displayport.org. 

I do not have the knowledge or competence to tell you more about the pixel clock/timing, but the value I’m referring to is specified in the user manual for my monitor (page 11). As you can see the value is actually 533.25MHz, to be precise.

The Amazon page for the gofanco PRO-HDMI2DP notes that “If the displayport monitor does not recognize the 594Mhz pixel clock rate, it will not convert. Monitors operating up to 533MHz pixel clock rate also will not support 4K resolution,” which is why I am suspecting it to be the case with the CAC-1331 as well.

I’ve tried forcing 8-bit color bitrate, but that does not change the result. I’ve also tried changing the Chroma Subsampling setting to RGB and YUV422 resulting in no output (and the error message about input timing showing up on my display), and YUV420 resulting in a 1080p output. 

I have tried literally all the different settings in the Video Output section of my PS5, but nothing results in a 4K output – not even 30Hz.

Hi Lensmann,

There are definitely different versions of DP all has to do with the bandwidth: https://www.club-3d.com/en/technology/8/displayport/

But this is way to technical for me to give any suitable answer. If you could forward your question to [email protected] I’m pretty sure they will help you with this.

Yes, there are different DP versions, but that has nothing to do with the cables. But you are right about the bandwidth, they have different bandwidth ratings. Seeing as I don’t know the specifications of the cables I’ve tried, I’ll try a DP8K certified cable later today. There’s a local store selling it.

If a DP8K certified cable won’t work, then I’d assume it’s safe to say it’s not a cable issue – and send them an e-mail. Thank you for the replies, Baak. 

No problem Lensmann,

DP versions have very much to do with the cables. If you connect a DP1.2 version cable between DP1.4 input and output. You will only get DP1.2 Bandwith.

A DisplayPort cable is not just a DisplayPort cable.

Good luck with the DP8K cable, let me know the outcome 🙂

No dice with the DP8K cable. Just to make sure I tried that one with my MacBook Pro too, and got a 4K@60Hz output. I’d say it’s safe to eliminate the DP cable being the problem. I’ll try contacting Club 3D support.

I can confirm that the adapter works with the Philips 4k Monitor (BDM4065UC) using the PS5 which I believe uses the 533Mhz timing. Maybe some monitor level setting is causing an issue. You could also try an EDID emulator which can trick the PS5 into thinking its connected to a HDMI2 display. 

I can confirm that the adapter works with the Philips 4k Monitor (BDM4065UC) using the PS5 which I believe uses the 533Mhz timing. Maybe some monitor level setting is causing an issue. You could also try an EDID emulator which can trick the PS5 into thinking its connected to a HDMI2 display. 

I did some tests with the CAC-1331 using 4096×2304 resolution. There were some issues with some timings. I suppose I could expect similar issues with 3840×2160 timings (I should do more tests and note the pixel clocks)

https://forums.macrumors.com/threads/m1-mini-22md4ka.2272647/post-29336435
https://forums.macrumors.com/threads/m1-mini-22md4ka.2272647/post-29342101
https://forums.macrumors.com/threads/mac-mini-hdmi-out-to-display-port-do-the-adapters-work.2274641/post-29378347

The disappointment here is that it can’t handle arbitrary pixel clocks.