Why not give it a go on your 3080? Might be surprised.
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It runs fine on my RTX 3060 12GB, it isnât particularly demanding, which isnât really surprising because it doesnât look much different on vs off. Itâs even debatable which looks better, it just looks a little bit different. Certainly nothing to get excited about, and people with consoles arenât missing anything much.
This is a very unremarkable looking game overall, which looks arguably worse than FM5 from 2013. I imagine the developers from that time are long gone; one wonders what they would have got out of the newer hardware. Probably something very impressive.
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Can confirm. I did this too and it looked like my GPU was barfing. 
When I tried it on anything higher than low, my GPU fans started roaring like a jet preparing for take-off.
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When I switched to 1920 x 1080 (now I use windowed mode if I want to see the effects), i noticed something odd about turning RTGI on. It uses less VRAM than just running full raytracing. 
Give it a try and see where you stand. I am convinced that my choice to use an odd 48 x 9 display is 99% of my problems. In 16 x 9 my 3080 can run RTGI at graphics high preset. And Iâm running a Ryzen R5 3600 still.
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The problem is I play the game in native 2160p and I am already almost out of V-RAM, sometimes if it rains I get the V-RAM warning message onscreen. I think 1080p wouldnât be a problem, but that would look blurry and ugly, I prefer native 2160p and FPS going from low 80âs to around 115 (Laguna Seca Corkscrew driving up there". I would probably lose quite a few percent playing it with RTGI. I wonât start using any of this fancy RT stuff in any game, until I upgraded. I already made enough bad experiences in other games that have RT effects and donât bother trying it out anymore. The 3080 simply is too weak for RT stuff in native 2160p.
I have enough patience to wait another few months. I think the GPU manufacturers will also release GPUâs with non binary v-ram chips this time for the lower specs (5060-5080). So I think the 5080 wonât only be limited to the standard 16 GB it will get released with, but also with 24 GB or something a bit later (RTX 5090 will have 32 GB V-RAM itâs crazy). But that might be released a bit later. I am sure I wonât buy a 5090, because itâs too power hungry and it will be too expensive. I simply refuse to buy a GPU that costs 2K Euro or whatever that is just too much for one piece of hardware.
Iâm running a RTX 3080 Ti (12 Gb). My resolution is 3840x2160 @120Hz. With most settings on ultra I can run RTGI on max without any hit to performance.
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Thatâs impossible. Your settings arenât correct then. RTGI is the most demanding RT effect that can be used.
If your performance is the same you donât have it on.
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I only have 10 GB V-RAM with my ASUS TUF GAMING RTX 3080 OC V1 (2019).
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Wonder how you can get away without performance hit.
Itâ so heavy even on 4090, Iâm just barely scraping 60 fps with everything maxed out and with TAA
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Heâs also using the RTGI work around. That version has RTGI effects in the cockpit. The version that released for PC players does not have RTGI in the cockpit.
I went out to see what RTGI looks like for us, and Iâm starting to feel disappointed.
I ran a testing session in the Toyota Hybrid P1 at Road America. The time was set to 12:00 static and the weather was clear. This is what we gotâŚ
While yes, I understand that RTGI in cockpit is turned off, but that doesnât explain why I see less detail than the same situation with all RT off?
Then thereâs what happens when you pull into the pits. During the scene where the pit crew is working on the car, the game shows the driver from a pseudo passenger camera. Much to my amazement, full RTGI effects were on.
But that is not the kicker. When I turned RT off and triples back on, I ran the same test session just to see what happens in the pits. There was no RTGI, but the lighting in the car was a hell of a lot brighter than the above picture. That **** is intentional. What the ever-living hell is the person that made the call to have the cockpits that dark thinking? If youâre going to paint the inside of the car infinite black, just get rid of the cockpit view all together. All this time I am thinking itâs probably an engine limitation, turns out its because someone made the choice to have crushed black interiors.
And to top it off⌠That crap comes with a performance hit for using the view???
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Ugh that looks bad.
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Wow I really wish they just put this in the game already.
With DLSS Performance? Nah I canât play the game with DLSS it looks like total garbage with it active.
Edit: Itâs the flagpoles, fences, antennas and all other thin lined things that look very aliased, jittery whatever you call it. And it produces horrible ghosting effects. In most games it somehow looks fine, but it doesnât look fine in the Forza games. I use DLSS Quality in FH5 because I have to for performance reasons and live with the ghosting effects, but I tried doing it in FM23 too and no it just isnât acceptable for me there. It must be native for me, DLAA is already too sharp for me and yeah DLSS is like smearing vaseline all over the TV. 
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DLSS performance - It is a compromise to get the best framerate on inadequate specs.
Also DLSS Performance - âYo dawg, I heard you like blurry imagesâŚâ Xhibit Meme.
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Yeah I know in some games it looks fine, but it doesnât in Forza. I play Starfield and Dying Light 2 with DLSS Balance, but use DLSS Quality in all other games, I always avoided DLSS Performance.
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At the resolution I run, itâs not blurry on performance, ultra performance is where it gets blurry for me.
Do a lap on the Daytona Tri-Oval and look exactly at the fences, flagpoles and such. Once you seen it you canât unsee it believe me.
I try to keep an eye on the track while Iâm racing, but Iâll take your word for it.