I have the new OLED an EVGA RTX3090 FTW3 and a 12900k running windows 11.
I have turned on and off adaptive sync, GSYNC, DSC, adaptive power, tried all DPs and HDMI with the supplied cables. The screen goes hard off when frame boost is enabled in the OSD, when you go above 240Hz, 270/540 and dual mode 720hz do not function, the screen is black with no OSD but power LED is on. Removing the power cable from the monitor and plugging it back in yields a frame where I can see the display port logo, but it goes off before anything can happen. I have been changing settings for 3 hours nearly because you'd hard reset the monitor every time if windows didn't revert changes. Updated the firmware on the monitor with no luck, tried changing the DP in the OSD. Updated the graphics card driver. Kind of sad if it's defective, I'll be using it at 240hz for a week or two begrudgingly to decide if I'll want to put up with a replacement or just ask for a refund.
In addition I'm seeing people saying they get 540hz from 3080s so I'm guessing it's not the GPU itself.
Plugged it into a Zephyrus 4070 with no luck. Same working fine at 240Hz but black/no OSD at 540 with no change in the power LED.
Contacted customer support after another while of messing with it and their conclusion was it's in need of repair, I'm thankful it's not my system at this point? But I'm skeptical still. All this research has made me feel like a fool, the GPU has Display Port DP1.4A which does support 1440p at 540Hz, with DSC 1.2 which I couldn't find anything specific about the ROG Swift monitor version of DSC though the monitor does use it and has a DP2.1 which is backwards compatible to DP1.4A but limits bandwidth. Something I had no idea about prior, my own fault, but another point of contention in general. I feel more that this is a lot of food for thought, there's no reason it should be doing this at 270Hz but not 240Hz. Hopefully better luck on the next one because I was really hoping it was a firmware or driver update away from working. I would hate to send it back just to find out my rickety old 3090 is the problem and my lack of readiness.
