Graphics Cards

[Jager995]

Good morning,
I recently had quite a few problems with my RX6900XT.
Before it just gave me the black screen and "solved" that problem only started working in FHD resolution.

My current configuration is:
- intel i7 4900K
- ram 8 gb Corsair
- gigabyte ga-z97x-gaming 5
- termaltake 750w

- QVE 4TB Samsung
- LG 27GN850 QHD screen

Everything worked fine until the latest windows update and AMD drivers.
I tried uninstalling and installing everything again. Change the BIOS settings, change the Radeon Adrenaline Software settings, but nothing.

On the new configuration the situation is even worse as I only get the black screen.
The new configuration is:
- Ryzen 7 5800x
- HyperX Predator 32GB RAM
- Gigabyte X570 Aorus (with F35c bios)
- Sharkoon 850W
- LG 27GN850 QHD screen

- QVE 4TB Samsung

I don't really know what to do.

[vialli100]

Hi,

To start with I would dump that Sharkoon PSU and buy something decent like Seasonic..

Sharkoon are even sold by WISH! If it's new I would pack it up and return it..

AMD recommend a minimum of 850w for your graphics card and it would have to be a decent one too...

I know Seasonic are expensive but you get what you pay for..

Your PSU is the part you need to spend money on..

Also, use 2 separate cables to power it not one into 2..

[Earnhardt]

Agree with @vialli100 ,

A good Corsair HX or RM PSU,even a good EVGA.I Don't use anything less than an 850W Platinum PSU.Currently on a 1200HXi.

The PSU is the single most important part in a PC,never cheap out.

[Jager995]

The PSU is not the problem, I have already done the tests with different power supplies and 2 cables for the power supply.

[EFermi]

Did you try both HDMI and DisplayPort or HDMI only? 

My 4K panel refuses to give 4K@10 bit per channel if I use HDMI, for example, so I use some cheap but hefty looking/feeling DP cable that I bought for some $24 on aliexpress years ago, and it just gets the job done.

[Jager995]

Yes, I tried both with HDMI and with DisplayPort

[EFermi]

What does custom resolution utility (CRU) say about your available display modes? Also, try creating a custom resolution through driver settings (control panel -> Display), will this work? 

[Jager995]

No, if I try to do a custom or s change resolution it brings me back to 1080