Pimax 8KX (model 2075) doesn't work with 7900XTX

Yesterday I receive a new Radeon 7900XTX card (to change my 6800XT), and the first test with a Pico 4 with Virtual Desktop were fine, but today I tried my Pimax 8KX and it didn’t work.

I have the lastest PiClient installed ( and when I connected the Pimax the software recogniced it and even began the tracking with the Base Stations. But when I put on the headset, the image was spinning and I coulnd’t use it. Then I change the 90Hz native mode to the 75Hz mode, and now every time I connect the 8KX the AMD Driver Crash and the HMD didn’t work.

I’m pretty sure this is a AMD Driver issue related, but it will be good if the Pimax Team could reveiw it, because this new cards have DP2.1 and maybe there is a hardware incompatibility.

The headset was woking fine with my old 6800XT in al the native mods.

1 Like


That’s definitely concerning.

Update: Somebody on the Pimax Discord has reported the 5kS doesn’t work either. Seems to be the same experience. Registered but played at like 4FPS(Their words) but then changing the refresh rate borked it.

I have the same spinning and crashing problem with amd 7900XT and Pimax 5K plus. It was working with my 6900xt.

Did you switch back to the older one? Any update on performance

No, I stayed with the 7900XTX, because the improvement with the Pico 4 is noticeable, and since it’s launch is my primary HMD also because Pimax didn’t support OVRMC.

I hope that Pimax address this issue with AMD for the current gen and also for the Crystal.

I tried the lastest AMD Drivers for the 7900XTX, and the behaviour is similar.

Now when I connect the 8KX with the PiClient open, I get a driver crash and a Diagonse of 10620 and then 20300. One time I get the 8KX tracked, but not working properly (I tried to open the Device Settings to put it in 90Hz, and the app hang).

This afternoon I’ll try with a PiTool version, but I don’t have high hopes in it.

I really hope that AMD give some new cards to @PimaxQuorra, @PimaxUSA and to the Pimax team and help them to solve this issue.

Just stumbled across this thread:

I tried a 7900 XTX for my 8K-X, too, coming from a RTX 3080.

=> Doesn’t work either:
Is connected and recognized without problems.
But as soon as starting ATS/ETS2 via OpenXR or simply the black grid room of SteamVR, I get horrible stutter and FPS below 20… Not playable at all.

As already stated in another thread here, AMD already admitted problems in VR in their latest driver 22.12.2 release notes.
So hopefully, they can fix this issue.

If the 7900 XTX then will perform good enough and even better than a RTX 4080, well, remains open…

I got mine working (kinda), actually:
7900 xtx, 12-2 radeon software, firmware, pitool

To get it running I had to kill and restart pitool a couple times but eventually it stabilized and was running. The problem though, is that once it was running, it would show tracking and connectivity to lighthouses, but the screen was either dead black screen, or sometimes careening/spinning wildly… Which from this thread, it sounds like where everyone is getting stuck.

For me, whether black screen or spin, I could then turn off lighthouse mode, and suddenly have perfectly clear video. On 9-axis mode, video works brilliantly… Too bad 9axis mode is vomit inducing and functionally unusable.

But to me, I have to wonder why the lighthouse/head tracking has anything at all to do with the video card or drivers
– and since I’m not coming up with a good answer to that, whether this has anything to do with drivers at all.
Probably the crashes, and we’ve seen that VR performance on other headsets is not any better than last gen, which AMD has admitted. But no other headsets are this completely non-functional. Performance, blame on AMD. But basic functionality? C’mon pimax, this is on you.

1 Like

Sorry, wrong.

=> Just google for “7900 xtx vr issue” and have fun reading through all the non-Pimax related threads and posts on Reddit, i.e. :wink:

i.e. this one clearly states that is “only” driver issues, and especially and apparently “only” on the Windows side:

Linux seems to work fine - even though the performance isn’t that overwhelming compared to a RTX 4080.

And the problem has been admitted by AMD in this topic, too, as you’ve written yourself:

But it is affecting many many VR headsets from all manufacturers, if you read closely, and when it comes to such a stuttering and FPS <20, I, from my point of view, would consider this as “completely non-functional” - almost eight years after DK2 :wink:

It is not that Pimax shouldn’t have a closer look, too, for sure, and especially discuss this with AMD.

But imho, first AMD must repair the general broken VR functionality before any headset manufacturer such as Pimax can investigate on further issues on their side.

The workaround for black screen in the headset is to use onboard graphics for your pancake display therefore seperating the two displays with different refresh rates. An oooold AMD driver bug that still plagues the Radeon drivers. Still working on the wildly spinning headset display issue. Not really making any headway on this one as far as workarounds go. Anyone found a way yet?

Tested latest Radeon Drivers 23.1.1 and the behaviour is the same, driver crash when the Pimax Driver tries to “talk” to the headset.

With the Pimax Client after the carsh an error 10620 is marked but quickly changed to error 20300 (and in the HMD the led is Red). If I stay in that way with the HMD connected, the Pimax drivers tries to talk with it again and get another Driver crash.

With the PiTool 275, after the crash que program freezes, so I couln’t see any error.

@PimaxQuorra I wanted to know if there is a way to change the HMD config without the PiTool/Pimax Client, maybe with a Firmware restore or something. Because when I have it at 90Hz native, at least I got a spinning image in the HMD and no driver crash.

EDIT: I reflashed the FW M299 (the same it had), and the crashes still there, so maybe this didn’t restore the default configuration, or the crash problem affects to the default configuration as well.

EDIT 2: I mounted the 6800XT in the PC, and with it the 8KX is working fine, but the configuration didn’t restore with the FW Flashing, because the HMD was in 75Hz (instead of 60) when I conected it to the PC.


Unfortunately, the HMD could not be configured without the Pitool/Pimax Client.

I would recommend filing a ticket with our tech specialist so that they can arrange a remote session and thoroughly troubleshoot your setup and headset.

In the meantime, I will notify our engineers, who may be able to propose an appropriate solution.

Thanks for the reply :slight_smile:

But after think about it, I returned the 7900XTX and I’ll go for a 4080/4090, which have less problems in VR (and also compatibility with DFR).

Meantime the 6800XT is performing well in the vast majority of games.


Indeed, I’ve seen quite a few reports that the 7900 isn’t functioning well in “VR,” not only with Pimax but with other VR-related apps.

Meanwhile, we’re working with AMD to resolve certain compatibility issues.

I hope the 40 series is going well for you!

1 Like

AMD themselves have acknowledged VR performance with the 7900 XT/XTX as a “bug” that they are actively working to fix. No one, with any headset, should be getting one of these cards right now.

My 5k Super isn’t working either. When I first plugged it in I was able to get it to display the Pimax home environment but at about 3fps. Video here → https://cdn.discordapp.com/attachments/376051993518800926/1053430686792548392/VID_20221216_215613.mp4

Since then it now just crashes whenever I turn on the headset with Pitool open. Very annoying and very concerning.

AMD have said that VR is broken on the new cards. Not pimax specific afaik.

1 Like

At least the other headsets work though.

1 Like

That’s not true. There is a known issue in the drivers that SOME games doesn’t have the performance it should, but with other games it works fine.

I used it with a Pico 4 + VD in godlike, and in MSFS 2020 the improve from a 6800XT is near 40%, in other 30% (ACC) and in other 10% or less (No Man’s Sky).

And they also work with other HMDs, so the cards work for VR, is not broken as you claim.

1 Like