I just orderd the RTX 4090 (Suprim X liquid). Will let you know how it works out and if I notice the issue (much). Will return the thing if it is a big issue and there is no hope of the issue being solved by either Pimax or Nvidia at all
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Didn’t @JonnyM buy this repeater in an attempt to solve it ? For him I recall it was no bueno? That thing is rather expensive as well.
Is this the one you have ?
I will try it though and just return it if it makes no difference.
Yes he is. But it doesn’t seem to have anything to do with that. As written, I have no problems even without a repeater in the games himself. However, my computer is also in the bios and co. fine-tuned. The only thing I haven’t cleaned up since 2017 is my windows 
PS: Ohhh, Norway. Was there in October, but much too short Incredibly country and very nice people.
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If you are a simmer I wouldn’t worry about it, for me the stutters are less frequent at 75hz too which is fine for sims. I mostly play shooters at 90hz so it’s much harder to ignore for me.
Yeah made no difference to the 4090, helps with stability when I switch back to the 3080 though so I got some use out of it.
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Most of my VR usage is not sims. Much is fast action games. With MSI Afterburner uninstalled, I am not experiencing latency issues in these games. I also don’t experience it in VRChat. And also not in sims.
I only get latency when I’m in the SteamVR void with no game running.
Got this reply from Nvidia
“Sorry for the delay in getting back to you. We’ve been working with few other users and have sufficient logs to debug the issue. I will certain update if we need additional details. Thank you for your patience.”
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i don’t agree. i’d know if i was experiencing latency or lag, i’ve been a vr user since 2014 and i know what’s normal vr or not, i play room scale and sims.
hope you get your issue sorted asap.
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I have 8K X v1 and 4090 and the lag is quite bad.
I just last night got an update from Nvidia saying they are still investigating the bug so it is acknowledged there. Last update from Pimax was before Christmas but also acknowledged they are still working on it. So to me via Support, both companies are acknowledging the issue at least.
Having no Afterburner or any other similar software does reduce the lag but I can’t remove it despite having tried literally everything.
I find the Nvidia driver version 522.25 has the smallest lag and for iRacing it is kinda usable once you get used to it and not moving the head much. For DCS it is pretty problematic. If you don’t move your head then no issue, but any fairly quick movements cause the lag. It is not just annoying but triggers immediate severe motion sickness. I haven’t tried any room scale VR at all since this issue as it surely won’t be playable.
As I understand it, although Varjo, HTV and Pimax are affected, (at least), not everyone experiences the issue. And maybe some people just aren’t sensitive to it so do have the issue but haven’t noticed it. To me it seems you couldn’t not notice it as it causes the motion sickness, it is possible some people don’t. Maybe some brains run at a faster frame rate than others, who knows.
The problem is that without understanding the cause, there is no guaranteed way of knowing whether or not you will get the issue n upgrade to a 4090. It does seem more people with the V1 8K X have the issue but I’m sure I saw before that some V2 users also had the issue. I could be wrong though.
All that said, the 4090 is a beast and the performance improvements in the 8K X are huge - for me in DCS at least where I have doubled my FPS from the 3090 - even with higher settings. So once this issue is resolved, the 4090/8K X combo is killer. I will say no real increase in FPS in iRacing but it was already pretty good. Must assume I am CPU bound there.
Yea you can always return a 4090 if no good…but for me that is like throwing the baby out with the bath water. I’m sure this will get fixed eventually but for sure it is extremely frustrating waiting so long. I got mine in October. But I am sticking with it as in the long run I’m sure it is worth it.
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Nice. Where in Norway did you stay ?
Strange. For me 90 Hz is way better than 75, 60 is unplayable as the stutter\jitter is extreme. 90 is playable, even though I had to train my VR-legs all over again. Still, there is something that feels “off” regardless.
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I cannot argue against what your experience. It just doesn’t make sense to me that some have it and some don’t if there is an actual issue regarding DSC\pipeline change. This variable should (if it is indeed the root cause) cause issues across the board imo.
If you setup your HMD in 60 Hz and look at the night sky in Pimax Home and look quickly from side to side, up\down. Except the normal flicker due to 60 Hz, do you not see massive jitter ? The entire world shifts and snaps around. Which gen HMD do you have ?
Hmmm… do you have any special settings in mind which might help here? Or interefere if not set properly / left at default?
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As promised: I received my RTX 4090 today. None of the described issues as in this topic occur with my current setup, or at least, I really do not notice them (not even a bit). There where still some weird things with Pitool and the HMD though.
This is what I use:
Hardware:
- 8KX DMAS (sn starting with 2076). Firmware: V2.1.255.2006
- 2 Lighthouse base stations 2.0
- 2 Sword controllers
- ASUS X570 Crosshair Dark Hero VIII / 32 GB RAM using DOCP profile, 3600 Mhz, 5950X CPU, (finetuned using curve optimizer etc, but nothing ‘highly overclocked’. Thouroughly tested and stable for months already)
- RTX 4090 (MSI Suprim X Liquid, previously RTX 3080 Gigabyte Gaming OC)
OS:
- Windows 11 21H2, build 22000.1335
Software:
- Pitool V1.0.1.277
- Process Lasso (Probalance enabled, idlesaver enabled, performance mode used both enabled and disabled; I’m still not sure if process lasso actually does something, but I guess it can’t hurt…)
- SteamVR beta 1.25.2
VR specific settings:
Pitool:
- tried 75,90 & 120 HZ refresh rates working without issue
- tried Normal and Large FOV
- Render quality 1.25
- contrast 0, brightness -1
- Fixed Foveated Rendering: Close (off)
- Not using parallel projections (normally, unless a game demands it)
- Not using Smart Smoothing, Not using Compulsive Smooth (close)
- Using Hidden Area Mask
(except for refresh rate and if needed, parallel projections, these are basically always my default settings for any game in Pitool)
SteamVR:
- General → render resolution per eye @84% (together with the 1.25 setting in Pitool, this amounts to 4284 x 3620)
- Motion smooting: Off
(Used moslty 1,25 in Pitool en 80% with the RTX 3080 before, but then most games I needed to turn down Eyecandy and also stick with 75Hz)).
This is what I tested so far:
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I upgraded my motherboard BIOS to the latest available version. Applied the same settings as before, which where always stable.
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I uninstalled MSI afterburner and Gigabyte RGB software before installing the RTX4090
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Installed latest Nvidia driver (was one version behind) after mounting the RTX4090
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Did some benchmarks with 3D mark ands was very impressed compared to previous results with RTX3080. I am using a 3440x1440 Gsync monitor @144hz and the RTX4090 is a bit overkill for most (desktop) games I would even say. Also the MSI is nice and quiet. I know the watercooled model is kind of useless performance wise, other AIB and the FE models overclock better, but I found it at a discount and it did not differ much from the air cooled model pricewise.
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Started Pitool and plugged in Pimax 8KX
First started at 75 HZ, Normal FOV, using my ‘standard’ settings and tried:
- Pimax Home
- SteamVR Home
- Kayak VR Mirage (some settings within game still tuned down, which was needed with RT3080)
I moved my head around extensively and fast many times during testing. Did not notice any issues. However, I do notice some slight flickering at the sides of the lenses sometimes, especially when in SteamVR Home. But I think I was also having this when I was using the RTX3080 before and I guess it is something common to the 8kx. It was not noticable very much and easy to ignore.
- I started fpsVR. fpsVR running did not give any issues either. I noticed there is now a lot of extra headroom to start putting my settings higher:
Tested Kayak VR Mirage at different scenes, mostly Norway with storm, using:
- Normal FOV: 75hz, 90 hz, 120hz all in game settings at highest possibled settings, using DLSS at quality 5.
Most I got with still just some GPU headroom left (max FPS basically all the time) with the game settings was:
→ Normal FOV, 120 Hz, Pitool @ 1.25 render quality, SteamVR @84% (I was really impressed, this is substantially good compared to what the RTX 3080 was capable of for me)
Alternatively I can use Large FOV as well, but only with 90HZ. As soon as I tried more (large @120, or using 1.5 in pitool or higher rendering in Steam VR) stability issues did occur and the game crashed.
I wound up settling for:
- 1.25 render quility in Pitool, 84% in Steam VR, Normal FOV and HMD at 90 Hz.
This will be my ‘default/base setting’ and I will finetune per game further of course, but I figure this should give me enough headroom to up the settings in most games.
I do not find the large FOV that much impressive as to give up on the GPU headroom it will cost nor do I want to settle for lower rendering or in game settings (with Kayak at least). 120Hz I do notice to be smoother and the GPU can handle it if I would use it for this game, but the RTX 4090 is working really hard at that point.
Issues I did notice:
A. Switching between 75/90/120 Hz sometimes crashes the complete PC. It will freeze completely, not even a blue screen. Task manager can not be brought up, just everything static. Need to reboot manually. So it is more convenient just to choose one mode and stick with it.
B. I have been having sound issues (low volume, no bass, crackling, mono sometimes, all sorts of issues) with the DMAS since the beginning, with my previous 8kx (RMA-ed because of weird wobble with tracking, still there in this HMD but much less) as well, but with this one also. I was using external speakers and not using DMAS at all anymore. With a new BIOS and GPU I gave it another go: At first I did not get any sound. I needed to set 7.1 sound for the device within Windows again. After that I played a test sound. It was delayed first, but it worked. I than needed to change speaker setup, turning of all the center and side speakers etc. The sound was ok now actually, probably as intended for the DMAS. However EVERY time I reboot the PC or unplug the HMD I need to change the settings back to 7.1 again and do the speaker setup again. Annoyingly these settings keep getting changed automatically after reboot or plugging in again. I think Windows simply does not detect it to be a 7.1 device (which it isn’t I think, but it really does not work otherwise…).
Conclusion:
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The described issue with the 8kx does not occur with the RTX4090 with my setup. As mentioned by @dstar before, the newer models might not be affected, but I can not tell for sure of course. Maybe Pimax or NVIDIA can confirm this after they reviewed their support tickets regarding the issues reported here. I might see what happens if I install MSI afterburner and overclock the RT4090, but do not see the need to overclock at this point.
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Although the RTX4090 was very very insanely expensive (which the whole high end VR thing still is and will probably remain for an unforseen time too unfortunately), I do not regret I bought it. Performance is so much better than the RTX 3080.
I started in VR and became really enthousiastic after finding the potential, using a CV1, i5-4690k and GTX970. I then upgraded several times in between, got a Samsung Oddysey plus, then the Pimax 8kx finally. But each step it is getting a more and more expensive hobby (especially with other simracing hardware…). This is why I think this will remain a niche for some time.
Of course there are also cheaper HMD’s and VR solutions, but those will never satisfy me enough because they keep having to much compromises. But, I am convinced the RTX 4090 does get the most out of the 8KX possible and it will do for the coming years. I am not going to upgrade to the crystal or the 12K or any other brand/model, unless it will be very cheap, without compromise and does not ask for another hardware upgrade… No vacation again this year, but no regrets either!
Small Update: Just tested everything while MSI Afterburner installed and running with an overclock profile as well: no issues within the game
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Thanks for sharing your experience, and glad, everything works fine for you 
But you’ve got a v2 - so something changed between v1 and v2 which affects latency and lag.
Does anyone know whether this can be resolved simply by a new DP-cable from Pimax…? Just a little, tiny hope 
Concerning the 4080/4090 itself, I am still a bit unsure about whether to go for a standard air cooled one, or buying a NVidia Founder’s Edition somewhere and install an alphacool Eiswolf 2 on it…
But well - first got this annoying issue to be fixed.
I’ve got 3 working cables and swapping doesn’t get rid of my slight stutter/jumping on head movements.
I saw quite a lot of complaints about DSC issues on the latest nvidia driver forum post, not VR but still could be related
Kristiansand and Stavanger
I hope I can do it again, then I’ll try to travel further north. Maybe then I’ll finally meet the Aurora.
nope, that is very individually tailored to the corresponding hardware. Leave it as it is.
For the V1 and 2 with the 8kx, the 2nd generation contains completely different, newer hardware. The scaler chip in Gen 1 was developed in 2018. The Gen1 is now 3 years old.
Because my 8kx runs with the 4090, I see the problem more with the data transfer between CPU and GPU and how the 4090 deals with it. Maybe my mainboard is so slow that the 4090 has more time to process the data correctly.
I will probably update my bios in the next few weeks. Before I do the fine adjustment again, I’ll test the 8kx. If I then also suffer from lags, I might be able to narrow down the cause.
@lnerd
sounds good, congratulations and have fun with your monster card!
I prefer also normal FOV and pitool 1.25 in most situations.
Bergen with Tyske Brygge and Floyen is worth a visit, too, even without Aurora. Very beautiful city. And when we’ve been there in April 2018, we’ve even been able to sit outside that evening although it has been a little bit windy.
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Of course I’m glad if I’m lucky enough not to be affected by the issues. However I think that if it does only affect the v1, Pimax should fix this. It is the same product you bought right? I’m sure they will think of something, they can’t ignore it.
Regarding the 4090, the MSI is a beast, but altogether, if I would have been able to get my hand on a founders edition, I probably would have gone for it, being cheaper and apparantly it performs better then some AIB models.
But yes, I would wait to if I was certain issues will occur of course… Hope they fix it!
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This issue isn’t just an Nvidia problem as it also affects my AMD7900 and 5K super. My issue is exactly as described by several users here in this forum. The 3D environment rotates with head movement to varying degrees dependent upon rotational speed of your head while constantly trying to properly maintain the original center reference. Seems like a tracking issue to me. My AMD 6900 doesn’t exhibit the issue either so it seems the tracking software is unable to resolve the visual center as fast as the scene is rendered by the more powerful GPU’s recently released.
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