Question Need help on a new system with an RX 9070 XT GPU connected to an ASUS monitor ?

[Alexoferith]

Hi, I wonder if anyone can help. I recently got this new system:

Ryzen 7 9800X3D
RX 9070 XT
32GB 6000
2TB NVMe
1000 Watt PSU
360 AIO for CPU
1x120 exhaust fan at rear
2x120 intake fans at front
ASUS XG27UCG monitor

My problem is as follows:
I only managed to install Win11Pro to the system due to sourcing the license key today. I have been busy downloading and installing drivers and software (to debloat the OS). And I only got round to install the latest Adraneline software. And it was only then I noticed that the system was running at 2560x1440@60hz but with 150% scaling!!!

The system was working without any hitch or hiccup all days. But right after I changed the resolution to 3840x2160@160Hz now my monitor will go into black screen for 1 sec and then back on, and then after around 10 or 15 seconds the screen will go black then will come back on after a few seconds. And it repeats like this, two black screens in sequence then after a minute of so, the 2 black screen sequence will happen.

Is this something to do with me using a HDMI cable? I did order a HDMI2.1 cable. On the box, it says "..can deliver 48Gb data" and 8K @ 60 Hz.

The monitor only has DP1.4 so that's why I chose to use HDMI.
So have I been scammed by buying that 8K HDMI cable?
Many thanks for your help in advance.

 

[Lutfij]

and software (to debloat the OS)
What software did you download and use?

 

[Alexoferith]

and software (to debloat the OS)
What software did you download and use?

I was downloading all the relevant drivers for the motherboard, GPU. Then I downloaded and installed Winhance to debloat the OS. It was while I was reading how to use Adrenaline, I noticed that the resolution was 3840x2160@60Hz. I totally forgot that I am now using RX9070XT instead of the RTX 3080 Laptop GPU on my ASUS laptop. The rest was as previous mentioned. Sigh...

 

[drivinfast247]

I was downloading all the relevant drivers for the motherboard, GPU. Then I downloaded and installed Winhance to debloat the OS. It was while I was reading how to use Adrenaline, I noticed that the resolution was 3840x2160@60Hz. I totally forgot that I am now using RX9070XT instead of the RTX 3080 Laptop GPU on my ASUS laptop. The rest was as previous mentioned. Sigh...

So, is your problem solved?

 

[Alexoferith]

What I am trying to find out is why the 48Gb HDMI cable didn't work. The system is back to normal when I change the refresh rate back to 60Hz! All these Chinese made cables, sigh!!! A genuine Sony HDMI 2.1 cable, 8K@60Hz, 4K@120Hz, 2M costs over £120 but these Chinese cables, cost from just over £5 to £16 depending on the length!

As a result, I will have to revert back to using DP1.4 cable... and, well, I don't know what to hope for now. The monitor definitely works with DP to USB-C (bi-directional) at 2560x1440@165Hz. So, the monitor is operating as in the specifications. I was using the laptop to download the motherboard manual to find out where the fan jumpers are.

 

[Alexoferith]

OK, finally, I got hold of a DP2.1 cable (incidentally, RX9070XT offers DP2.1b and my monitor only DP1.4). Now the system is running at 3840x2160 with 150% scale @160Hz. I didn't select the scale. The resolution is limited by the monitor and so is the refresh rate. I don't understand the scale part. I would be most grateful if experienced users can enlighten me.

I did try to remove the scale back to 100% but everything is too small for me to read, being 65 and short sighted with Presbyopia. The 150% scale makes the screen display much more readable for me. It is almost like at 2560x1440 but little bit bigger.

I did notice, using the benchmark facility of Black Myth - Wukong, that the 150% scale does reduce the performance, be it just a touch. The FPS is much much better than my last machine, a laptop with RTX3080. I am still learning Adrenaline.

Now, I am attempting to undervolt the card. However, it is a touch confusing for me as there is no video on undervolting the exact same card of mine. So, I am a bit worrying about bricking my GPU. So, even at 65, there are still much to learn...
Finally, thank you all for your inputs and suggestions, or rather guiding thoughts.