WipeUout

I did some testing a few weeks ago to see the loss between VR and 2D. Running the same track with the same settings give me a 125-156 FPS in 2D using a 4k monitor, compared to 56-67 FPS in 3D using my Pimax 8kX at 4k per eye. This will vary a bit depending on the settings used but as a general rule, you can expect your 3D performance to degrade to 42 to 45% of what you get in 2D for the same settings in the same scenario. Since the Crystal and the 8kX share the same number of pixels, you should get similar results unless you have some settings that only apply to VR (or 2D) that could explain the difference.

My understanding is that the correction for barrel distortion is adapted depending on the lenses, actual panel size and geometry used. What you state means that the simulation rendering pipeline would need to know the particulars of each HMD in order to apply this transformation. And also, barrel distortion is more akin to an upscaling operation that rendering an actual image. If that was the case, you would have about 1/3 of the FPS in VR compared to 2D at thew same resolution, what we have is more between 43% and 47% of the FPS.

That is an 8 months old video. Wonder if he can say that now. He states that he tried a pimax 5k+ and 8k (released in 2018!) but did not talk about the 8kX? There are always holes in those youtubers videos.

Just going for FFR on my 8kX shreds 1 to 1.5 ms on my GPU frame time, DFR will give even more.

Then it seems that your GPU can't keep up with the refreshrate of the HMD. You have three possible approaches: 1-lower your settings, 2-lower your HMD refresh rate (I think that the Crystal does not allow lower than 90hz), 3-Upgrade your GPU.

Unfortunately, there is no ''standardized" benchmark for DCS. And the infinite possible hardware combination out there makes it very difficult to compare, not to mention all possible combination of airframe/terrain/mission type and settings you can use to bechmark. I suggest you set yourself a couple of tracks and create list of results and go from there. The best and most meaningful comparison is againt your own baseline. This will be usefull to see performance and quality effects cause by settings/software/hardware changes. You can also always search the forum for "similar systems' performance, most of us do post them time to time.

On my system, still no significant difference between HAGS on or off. In my test track (F-18/Caucasus), I get a 0.02ms difference in GPU average frametime (8.62 vs 8.64) and a difference of 0.05ms CPU average frametime (2.78 vs 2.83) which is within the margin of error.

I think motion blur is overrated. Better to use motion reprojection, same effect but at least you have a smoother experience...

I don't think it is related to smart smoothing. Never seen this with my 8kX, but it could be different with the crystal. It looks more like a power glitch. what is your setup? Could it be that your PSU is not keeping up with the power draw?

Well in that case, I would suggest to start with low settings and move your way up. I am not familiar with the reverb g1 but what I suggest is to try to avoid using motion reprojection and aim for native resolution plus some upscaling, the 4090 should be able to handle this.

Totally disagree, I can play in my 8kX for hours without any pain or discomfort other that I can be a little hot. Maybe they goofed with the crystal but that is not the case with all Pimax HMD!

Are you using motion reprojection? That could explain the "jitter", if you see it only on the sides. You should expand on what software setting/version you use, there might be a problem there also. You do have a high end gear and your experience should be silky smooth!

Some additional findings: Combination of PimaxXR 0.3.4 with Pimax client 1.11 offers the smoothest ride. Client 1.12 and 1.13 are not performing as fast as 1.11 and cause in some cases a 0.5ms increase in GPU frametime. If your sim with your HMD refresh rate at 90hz, then PimaxXR 0.4.0 causes some sporadic stutters. Reverting back to PimaxXR 0.3.4 solves the issue combined with Pimax client 1.11 Pimax client is hard to find, here is the link: https://drive.google.com/file/d/1uj9v26nPSkSe2Og4JPMIzxNIgOnlcFCl/view?pli=1

Same here, I did tests from a 4k desktop resolution down to 800x600 with a 0.1 ms GPU frametime difference, which is within the margin of error. No change in performance.

Agree, this will drive or accelerate innovation. I feel the same with my expen$ive 8kX. But I also feel that I still do not see or experience the full capabilities of my HMD with current hardware. There is still lots of room to improve performance and quality before even thinking to go to higher resolution HMD.

Running the same track with the same settings give me a 125-156 FPS in 2D using a 4k monitor, compared to 56-67 FPS in 3D using my Pimax 8kX at 4k per eye. This will vary a bit depending on the settings used but as a general rule, you can expect your 3D performance to degrade to 42 to 45% of what you get in 2D for the same settings in the same scenario.

Do yourself a favor, follow the instruction in the first two posts here: This could improve considerably your experience with your Valve index.

Same here, I am convinced now that it is a transitional product, sticking with my 8kX. Thanks @Txbitt for the review!

VR is not as sharp as a monitor. Consider if your 4k monitor occupy 60 degree of your field of view, this equates to 60+ pixels per degree (PPD). Your Crystal has 35 PPD, which is much less but still the best resolution you can expect from VR so far. The VR proposition is: Instead of looking at a simulation, you are in the simulation. You compromise image quality for immersion.

Open OXRTK at the first menu page "Performance" then select "preset" for "Fixed Foveated rendering", then select performance. You can play with more settings if you select custom, you can define size of concentric rings and specific resolution for each of them.

Shadows to flat, heat blur off, Anis. Filtering off and bloom effect off. Use FFR in OXRTK, this will give you a substantial gain without sacrificing resolution in your sweet spot. Resolution in DCS option does not affect VR performance noticeably. I did some testing on this and saw 0.1 ms drop using 800x600 which is within the margin of error.

I assume you are running DCS-MT? The Pimax FFR does not work with MT, only the OXRTK FFR will work and I use the performance preset. Did you test this? It might be different for an 8K+ vs 8KX.

Seeing the same here, not a lot but definetely longer than previous OB version.

It's in your signature bloc: GPU: TITAN RTX - 2175 MHz, liquid cooled CPU: 9900K - 5.4 GHz, liquid cooled / MB: ASUS Maximus XI Gene RAM: G.Skill 32GB 4000 MHz Samsung B-Die SSD: Intel Optane 905P - 960GB

As I undertand it, distortion correction is not as demanding as generating a 3d image, but rather closer to a re-sampling operation. The Crystal has the same amount of pixel per eye than the 8kX: 8,294,400 pixels per eye. I think you are starving your HMD with the Titan RTX which has 57% of a 4080's performance according to Passmark charts.