Tried having a go at deshrouding the 7900 XTX Pulse this evening, did not go well! (I don't think the fans on the Pulse are awful, just a bit annoying under load, but my case (NR200) is set up nicely to have the GPU sitting atop two full size Noctua fans)
The
Sapphire website pic made it look like a simple job (should emphasise here that I've never tried doing a deshroud before), but after taking out two screws attaching the shroud to the backplate and two screws attaching it to the IO panel, it did not want to come off. I think there are 4 more screws under the shroud attaching it directly to the heatsink, but they're impossible to get to (I have crap pics if anyone wants to see).
Sent an email to the TechPowerUp editor who did a teardown of the Pulse 7900 XT, which looks to be identical in terms of case/form, and actually got a nice reply but what he was saying didn't really map to what I was seeing on the GPU.