Did you make sure it is the GPU that is bottlenecking you? When playing, run Windows Task Manager in the background and have a look if your GPU is actually utilized properly, if the VRAM is sufficient and such. Maybe that can tell us something.
The thing is it performs much better under Linux Open Source Mesa / Gallium. But the X-plane dev has asked me not to use the Mesa as they are not supporting it. VRAM / RAM maybe bottle necking but then why would the Mesa drivers not show performance issues.
The bottle necks are CPU / RAM which i will be upgrading later, but my problem is under windows. Hence i carried out the other tests like testing ATS / DCS / il2 / Dirt Rally.
I will check what you suggest and get back in a couple of days.
If you want to let AMD know about this, this is a USER TO USER support forum, meaning users like you helping other users. Nobody from driver development here. For AMD to know about the issue, file an ISSUE REPORT the link is on the driver download page and in preferences in Radeon Settings on your computer. Please do this as the more people that complain them more seriously they take the issue. I have read many reports of these issues but it is likely not many are actually being reported properly.
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Thanks, i will report it to AMD support.