OP thus far has only told us they have a (refurbished) DWF. We have no idea on the exact model of the IPS display they have. Is it a top end LCD? Who knows? We certainly haven't been told and can look it up.
Hence, the questions to OP about if they've got everything right and correct setup for their comparison. Which is normal to bring up in case they missed something.
We don't know how they are running HDR content:
Is the cables used even able to transmit the signal? HDMI cables can still transmit the video signal, without the HDR aspect if it can't carry it as the cable was from a previous gen.
Are they viewing HDR content with a HDR capable player? Trying to watch the LG 2020 OLED Demo for example on Firefox won't work as HDR doesn't work on it. Edge however, will work. In a previous post of theirs, they inquired about using Chrome in full screen, but a quick search around suggests that Chrome doesn't support HDR playback.
Were they using the same adjusted display settings (in Windows) for their old display (IPS) for the new display (OLED) as well? As this would change how things look on the OLED compared to the IPS but they are both getting a modified display signal that's adjusted for the IPS. Or was it individually modified? If so, how was it modified?
The issue is, all of these things (and more) are something easy that could have been missed and could have impacted on how the display works and appears to show "no difference" to an IPS in OPs case. And OPs last post in this thread tells us they're not tech savvy. So I'm guessing there'll be no progress on this front.
The only thing we do know for certain, is that OP plays games, and does not do anything image related. Hence their comment on why the need for impressive colours for stuff in Doom. So we know that colour accuracy for things like video and photos is not their use case. From what they have posted previously, being able to see stuff on screen that would have been invisible on an IPS, is not a concern for them. Colours and brightness that pops from the screen appears to be what they were going for. Which means their existing (or future) display doesn't even need to be a high end IPS, since they have been adjusting the displays already. It just needs to be bright and pop. Which is not what any OLED is. So the punt they made for it (a previous post of theirs) for the refurbished DWF (unsure if from Alienware or from third party, this was never stated), would suggest it's just them having buyers remorse; which would have nothing to do with OLED itself as a technology not being better in any way than IPS.
It's the 240 hz(oc 280) alienware 27 inch 1440p ips
Chrome doesn't show HDR? The youtube videos let me pick the HDR option and they have the HDR icon while running? I would be pumped if this is the case, though I've downloaded all the like 40 gig HDR heavy hitting movies (blade runner 2049, interstellar, covenant etc) for VLC player and they are similarly unimposing. Interstellar looks rough in particular, though I don't think that's the screens. Covenant is the best looking movie I've ever seen, though Scott is a shell of himself at this point.
I'm running the DP 1.4 cables that came with it, though I've also tried hdmi 2.0, and replacement cables of both types that were the highest numbers amazon showed for sale. I'm not gonna turn the lights on and look closely at the wires, but they were the highest available numbered cables 8 months ago as I said, and this is at all manner of 8/10/12 bit and 60/100/165 hz.
I don't clone the screens, I just generally window-shift-arrow key them back and forth endlessly like a dunce, trying to convince myself it was worth not getting a brighter, larger 4k screen.
That LG oled 2020 video everyone posts looks just as black on this IPS with some crude 1970s flashlight backlighting as it does on the oled.
I'm not angry btw, I've wasted much more money than a dubious monitor decision, and it's not like it looks bad or anything, and it was dirt cheap(for an oled). Like I said, until this broken foot I was exclusively playing iracing in the quest anyways. Doom Eternal looks good on the glossy display, and I can still play which I was pleased with, I was worried I wouldn't have the muscle memory for PB swaps anymore but it's like riding a bike. I'd rather be playing it on the 280 hz than the oled though, but I have the IPS setup to the side so I can't really without re-doing my desk which I don't care enough to do.
edit: I just watched 10 minutes of spaceship nonsense again, it's the same thing. One is longer. It's the same damn thing