I looked at the dimensions for all of them (they are all over 340 mm) and figured that the Taichi might just fit, because it only stretches the full 346 mm in the center and not across the full width, unlike the others.
It was not easy though, to get the L-shaped rear into the rear slot but with rotations across all three axes and my girlfriend helping stretch the case open a bit for that extra mm, we managed.
OK so despite gathering about 20 different framerate numbers in VR and 4K scenarios with the RTX 3080 last night, I’m not showing any sheets with performance comparison now. There have been some showstoppers that made it pointless to run every scenario on the RX 7900 XT and compare the numbers. The expectation is between 20 and 30% GPU performance improvement, based on most games and benchmarks.
In VR, the headset does not seem to render at a solid 60 Hz, unlike what I’m used to in OpenXR with other GPUs (RX 6800 XT and RTX 3080). It feels choppy when looking around, like we used to have in SteamVR with the 45 or 90 fps rendering.
In the DCS framerate monitor, the RTX 3080 displays GPU bottlenecked at X fps most of the time, but the RX 7900 XT only shows CPU bottlenecked (rendering thread).
Speculating, these issues seem to indicate problems with the way the driver interfaces with OpenXR runtime.
Latest AMD Adrenalin Edition 23.7.2
Latest Windows 10
Latest Open Beta (using the multi-threading binary)
WMR OpenXR Runtime (Microsoft Store)
HP Reverb G2
And yes, I did run DDU when switching GPUs and cleaned out all the DCS shader caches with this script, even edited it to clean some more folders in the Mods/Terrain subfolders and ran a repair afterwards.
I guess the one thing I could still try is to use a different OpenXR runtime, i.e. OpenXR Toolkit.
If that doesn’t work, I’ll have to send it back. I’d rather game in a fluid 45/60 fps than have a more powerful card at 90 that drops back to 45 fps when it can’t make that. I am not prepared to lower my DCS graphics settings enough to keep 90 all the time, I like shadows in my cockpit, especially if I’m paying ~250 eur. It would be a shame as I was looking forward to playing with lots of Linux distributions, which is a lot easier with an AMD card.
P.S. I had trouble with accidentally changing the DCS settings and I accidentally tried to run the shader cache cleaner script in non-admin mode, and then faced a PowerShell security setting (execution policy) preventing me from properly running it (could only spot that when running it from the terminal) so I have been spending all afternoon on this, with many pc restarts too.
I’m on almost the same setup as you are, except I have a 5800x3d, and I eventually gave up and went back to TrackIR. I love the IDEA behind VR, but I think until some company like AMD sits down and tries to integrate an entire GPU/CPU/RAM/Drivers/even buy a VR corp itself, to get a dedicated system together that can offer a more flawless experience. I DO think it can be done with current technology, but my system would change from one bootup to another. Sometimes it was flawless and free of stutters, other times, it’d be completely unusable.
I still love you all - I’ve been lurking and flying solo and with the Hollo Pointe crew, but I’ve improved my skills to the point that I don’t get shot down EVERY time I fly!
Yeah - sorry - I saw 7800x3d in another thread and got confused.
I even bought 64g of RAM to try and improve things with no luck.
I do think AMD could solve this. I just think they’re becoming too focused on stock instead of the 3-5 year plan.
OH and just FTR - gang - Sryan (I won’t @ him but he knows) is growing up good! Almost has his PhD and is in the company of a BEAUTIFUL young lady. I had to re-hinge my jaw when he sent pics. I feel like a cousin or BB to that young man’s growth and development.
They are focused on Fixing rDNA3, and Working on Making sure the problem doesn’t continue to rDNA5, rDNA4 Large GPUs were cancelled.
The latency is likely the result of the delay in the cache to infinity fabric, the infinity fabric needs to be able to transfer a lot faster, they underestimated the lag between the GCDs and MCDs effect.
Unfortunately, it seems @SkateZilla is right and this latency is probably a hardware issue. The VR driver update of July certainly hasn’t made the DCS VR experience on the RX 7900 XT better than it is on the last gen cards (RTX 3080, RX 6900 XT).
Seeing as there will be no RX 8900 XT, I guess I will join our AMD expert in waiting for the RX 9900 RXxXTXxXR (just guessing here how many X’s will be added in 2 generations).
Tbh, both Nvidia and AMD are underwhelming this generation.
RTX 4070 is on-par with RTX 3080 performance-wise, just more efficient.
So unless you really want Nvidia’s frame generation or play a lot with raytracing or do a lot of streaming (AV1 encoding), there’s no reason why you couldn’t just get a last gen card and save €150.
IMO RX 6800 XT, RTX 3080 (Ti), RX 69(50) XT are still great cards to play DCS on in the same price range or lower than the RTX 4070. Get one if you find a good deal.
RX 6900 XT and RX 6950 XT even outperform the RTX 4070, but with DLSS 2 on the horizon, you may prefer an Nvidia card until AMD can offer significantly better performance.
The RX 7900 XT still has latency issues in VR yes, even after the July driver update with improved VR performance. Probably something to do with the chiplet architecture needing some refinement. This is the first chiplet-based GPU.
The RTX 4070 is architecturally closer to AMD’s RX 6000 series than to the RTX 3000 series though: it has low memory bandwidth and uses an enlarged cache instead. This leads to high power efficiency and performance does not suffer much in most applications.
But I expect that similarly to the RX 6000 series’ Infinity Cache, it will cause reduced performance in high-res VR flight simulators, at least compared to cards like the RTX 3080 (Ti) and 3090.
Also, the RTX 4000 cards are overpriced.
For now, I’d recommend to look for a good deal on a last-gen card: RTX 3080, 3080 Ti, or 3090.
RX 6900 XT or RX 6950 XT can be had really cheaply sometimes too, so may be worth it.
But no, with current drivers and prices I don’t recommend buying either of the cards you mention. Unless you absolutely need stuff like AV1 encoding perhaps…
@Rapier I’m sorry I just noticed I misread your question.
The RX 7800 XT is not a chiplet design so it should not suffer the same problems as the 7900 series.
Looking at that review, it seems like the higher the resolution, the more it outperforms the RTX 4070. That does not bode well for VR.
We have been hearing about DLSS 2 for DCS for a while now, but otherwise I see no reason why the RTX 4070 would be a better fit for VR.
I haven’t found any reports of the RX 7800 XT in DCS VR so there’s only one way to find out if it’s a good fit…