Hi
In my opinion GPU performance is a major point for an enjoyable/playable VR experience. If your FPS gets to low (<60 fps) (no matter which headset) it starts to loose a lot of it’s immersiveness. It’s the same thing with low resolution (to boost the frame rate) and the fact, that you will have big effect on graphics quality (readability of MFD and numbers, kneeboard, etc).
In conclution: You have to think about getting a complete new hardware setup otherwise the weakest element in the chain will tear your VR experience down. Otherwise with just a good headset you may get very disappointed…
I run a valve index with a RTX 4090 and before I had a RTX 2080Ti and made the upgrade because of VR implementation in Falcon with 4.37. Now I use about 60% of the 4090 for the index. Soon I will go for an Quest 3 to get more out of my VR setup…
May there is a way, that you can try somewhere how it is before you make big investments…