It really shouldn't be the AMD graphics - it could be, but since it is a 'modern' offering, I really do doubt it. Do you have the 4Gig Patch or LAA properly enabled on your SH4.exe file? In spite of having 32gig of RAM in your machine, the game is 32-bit, and as such will be assigned to a shared "sandbox" for all 32-bit apps by Windows. As such, that is a 4gig max sandbox, and generally, all apps only get a basic 1gig portion, which they might have to share and swap with other 32-bit apps, if there are more of them running. When you apply one of the patches to the executable file, it tells Windows that the app can "flat address" the full 4Gig of RAM, which would mean the app could then use and share about 3.4 gig of that RAM area. But try looking a various angles there, and see if you can isolate what is eating the cycles there. You also should not be going so low on fps forward either...
You could also check your graphic settings in both the game and in the AMD config app to be certain you're not using anti-aliasing beyond what the game does, as well as other little "tweaks" that look great in 'modern' games, but really wastefully eat the clock in a 32-bit DirectX 9 game. Also, the resolution you are running the game at ~really~ matters. From all indications on my 4k monitor, the game's bandwidth is really stressed at that resolution, so I now run mine (usually) at 1920x1080 max, which of course, complicates other aspects of the game and computer. If I'm going to do a video, I will up the resolution because it def looks better at that size - lol... But, there is no happy medium with a 'modern' computer and 'old' DirectX 9 game any longer...
