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I'm going to assume that this is a desktop since you posted a motherboard as a spec, so make sure that Windows isn't confused and trying to use any iGPU installed on your CPU (don't know if it comes with one built in). I mention this because the software that determines what to use for rendering parts of the VR experience (your good card or any built in backup features) is a bit buggy. Usually you can set it in the Nvidia control panel, but latest versions of Windows 10 require you to go through the Display settings now.
For SteamVR, are you having Steam handing your resolution or are you setting it yourself? if the former, what is the resolution per eye it is estimating? If it is set too low, no amount of AA will be visible to you because Steam will be lowering things to run on your system. (Whether it is accurate or not is up to you)
For your example of No Man's Sky, what Anti-aliasing options did you try from the game? FXAA does practically nothing (and if you want to use it, it is recommended to apply from the Nvidia control panel with enhancements on) while TLAA should work but is really blurry. (VR support for NMS is based on PSVR, so things will always perform a little off for us PC users. Jaggies and pop ins are a part of the experience sadly) I don't know if AA is available on Dungeon Knight, and I haven't really seen it. In both cases, I turn off all AA and instead use the SteamVR per game resolution scaling to make up the difference. You can hand control the super sampling this way and see the results in realtime. I combine this with fpsVR to find the sweet spot between looks and performance. If you crank up the SS and still can't see the difference, then you may have something else as the issue that is more hardware related. (You mentioned you tried multiple headsets on different PCs, but didn't mention how those went. So I can't help assess any config differences there)
i am using the newest stable version of windows 10 now fully updated.
my iGPU is disabled in bios.
on the resolution i dont know i usually let steam set it i let Resolution at 100% also tried full values like 200% or 300-500% nothing changes.. maybe the bug lies there in the resolution is not being applied correctly hmm! ah and yes i went from odyssey plus to pimax8k plus headset great sharp image now but still same issues with jagged edges in any game VR game!
i tried all AA setings in no mans sky TLAA was the best for me but did only very minor enhance to no AA.
yes i tried odyssey plus on 2 different pcs one with a 1070Ti other with a 2080Ti no difference! also no difference for jaggies between odyssey and pimax headset :(
If it is too low, try cranking these up. (If you still have the odyssey and want to experiment, you'll need to use the Windows Mixed Reality menu found on the SteamVR dashboard and make sure the option to allow for SteamVR to use its Per Application settings is enabled. Not sure if something similar is needed for the Primax) If you crank up the resolutions super high, it should look clear but become a slide show framerate wise. If you get the framerate drop, but no clarity improvement than we know it has to be something outside of SteamVR.
Double check with Windows to make sure it isn't confused about the the iGPU. You'd need to go to the Display settings, then scroll down to the Graphics Settings option. From there, select the game you want (you may have to find it for Windows. 2020, and M$ still can't identify applications like the old Nvidia panel could) and try setting that game to High Performance. I've had a few games that when Nvidia was handling the graphic card assignment it had no problem identifying where to go, but Windows auto went to the iGPU (which then had to use whatever logic to convert to the graphics card afterwards everytime the game was working. Made things really slow)
I did just think of something though. How are the USB ports on your motherboard? I'm assuming it has 3.0 or higher, but I know some manufacturers can have issues with their USB ports. (Not enough power going to them and such) It could be possible that you may need to use a 3.0 powered hub to make sure enough data is going to the HMD.
Be careful with using NMS for your benchmark, it's notorious for having lots of Jaggies no matter what you do. Only the beefy-est of machines can play it with minimized jaggies, and it still takes a lot (it is usually the CPU that is the biggest choke point in that game, though it's own internal resolutions has some weirdness since it isn't a roomscale game)
this is not the resolution you discribed for the Pimax 8k plus
i now put under display options every game and steamvr to high perfomance not use system standart i will test!
also im curious my headset is not recognized as new display it still show only my pflatscreen there in the display options ..
yes i have an asus ROG maximus hero XI Formula mainboard with usb on it dont have a hub atm should get one!
And yeah, SteamVR is kind of terrible in how it sets the Per Eye resolution. It's a slider that gives estimations instead of letting you set the number manually, so you are at it's mercy when calculating what 100% means. I think it uses Steam's own Vive as it's base setting for the slider, which isn't even a variable factor for any of the other HMD.