I would run a pre-boot diagnostic, to see if any error codes pop up: Pre-boot diagnostics  If that passes all tests, I would check to see what the video card bios version is of your current RTX 3080. I would use a free program called GPU-Z and check under BIOS version what is says. The latest BIOS for the RTX 3080 (OEM DELL) is 94.02.59.00.E1. If you have a lesser version, and since you are experiencing DP issues with the card, I would recommend flashing the Video Card to BIOS to the latest version. It can be had from the DELL drivers site: Dell Drivers    Only perform this BIOS flash if the system is 100% stable and passes all pre boot diagnostic tests.   If after all of this it still does not work properly, I would contact [NAME]-Cares to check your warranty options. If any of the pre-boot diagnostics fail, also contact dell-cares.
I bought an Alienware AW2521FA gaming monitor and from the first use, I ran a performance test on my computer and when it got to 3D graphics I got a black screen the no DP signal then the monitor went in standby. The only way to make it work again is reseting the computer. I thought it is strange and maybe a bug from that software so i started using it and it continued to do that randomly, while playing a game or while simply being on desktop. I tried everything. The problem is that it works on lower Hz like 60, but as soon as i go to 144 or 240 it does this in a couple minutes. I also tried with the hdmi cable and i get the no signal message. I tried updating all or my drivers and firmware and it did nothing. My computer is also an alienware, with a RTX 3080 graphics card. I also tried changing monitor settings then going back to factory settings and i also used gsync but it is still the same. I cannot use the monitor on mor than 60 Hz. So i contacted dell and told them about the problem and they sent me another monitor, but rhe problem is the same. Today i tried to do another update to my graphics card drivers and as soon as it finished i got the no DP signal again. Can anyone help me? I am not able to use the computer and shutting it down from the button so many times becomes really scary because it might affect some of the pieces.
Aurora R12, AW2521FA, no DP signal