I can only give you an impression of the RX 6900 XT, I own. Actually mine is the Gigabyte Gaming OC Model. It has replaced the Vega64 I was using before (which still held up surprisingly good during the alpha, but began to choke on the workload when trying to run VR in MSFS).
In terms of raw rasterization performance, the only thing that beats it is the RTX 3090 and not by that far (especially when taking the extra budget into account).
I am running it with the Valve Index in VR and can reach up to 45 fps with decent settings, including setting super sampling in SteamVR to 150% or even above.
Also it delivers up to 58 fps on Ultra settings when playing “pancake” on a Samsung G9 monitor (5120x1440). Please note that I am using a Ryzen 7 2700X CPU, so please take into account that no SAM boosting happens on that machine.
In terms of CTDs, I am still testing and trying to narrow down options, I will gladly share my current findings:
- Disabling the Issue detection feature in AMD driver seems to prevent at least driver timeout crashes.
- I was able to do a full flight from Frankfurt to Stansted in a A320 Neo, yesterday without crashing. I assume the more you push it to the max, the more likely you might end up with a CTD, though I also encountered one while the GPU load was around 85%
- Increasing the power limit in the driver by 3-5% and raising the fan curve up seems to help, too
- CTDs are more likely to happen, if you fiddle around with graphics settings in your active game session a lot. If you restart MSFS and just do a flight without changing anything, you might have better chances
- It looks like undervolting and reducing the max frequency slightly seems to drastically lower the chance of a CTD to happen.
If you got the chance to buy it at MSRP, it is a no-brainer. Swap it out and enjoy it. I am pretty sure, that the CTDs will be dealt with sooner or later and at least it looks like things can be done to at least get them appear less often in the meantime.
Aside from MSFS you will find that basically every other game will massively benefit from that GPU, well okay… unless you are enabling raytracing, I guess it is only fair to mention that this is an area, AMD still has to improve on.