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ATI Rebrands performance question

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Hi everyone!

My Hackintosh is now running well for some weeks, but I was asking me if macOS uses more graphic resources as Windows?
I don't have any graphical glitches on my R7 370 2GB graphics card but it looks like it doesn't use the full resources/performance of the card. (ex: Game got 3 lower graphic levels and 4K videos are stuttering more often as on Windows)

In my opinion the card is maybe performing slower because it's a rebranded HD 7870 (Pitcairn GCN 1.0), but I'm not sure.

Is there a way to look and adjust clock speed?
Or can I possibly fix it with Framebuffer patching? (I use the default one and extracted the bios.rom already.)

Settings I use in Clover to get the card working:
InjectATI checked
FakeID: 0x68101002
Framebuffer: DefaultRadeon (Futomaki creates a black screen on HDMI port)
VRAM: 2.048
Ports: 4
Do you know if this will work with a actual Mac Pro to get the card to work?
 
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