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AMD Radeon Performance Enhanced SSDT

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My "Geek5" (actually GB 5.1.1) below. SMBIOS iMac 19,1 - Mojave 10.14.6 (build 18G4032), RX 580 Nitro+, top switch on card in rear position ("quiet") so not peak-performance setup. No SSDT compared with SSDT v 1.0 installed in ACPI/patched. No SSDT on left, with SSDT on right. Will follow with results in switch's "performance" position.

Quiet Mode - No SSDT.jpgQuiet Mode - With SSDT V1.0.jpg
 
My "Geek5" (actually GB 5.1.1) below. SMBIOS iMac 19,1 - Mojave 10.14.6 (build 18G4032), RX 580 Nitro+, top switch on card in rear position ("quiet") so not peak-performance setup. No SSDT compared with SSDT v 1.0 installed in ACPI/patched. No SSDT on left, with SSDT on right. Will follow with results in switch's "performance" position.

View attachment 466119View attachment 466121

Use Catalina, was made for it.
 
GEEKBENCH 5.1.1 (best scores)
With SSDT (without Clover Injection of FB)
Metal 52031
Metal 52043 (after sleep/wake)
OpenCL 43683
OpenCL 46310 (after sleep/wake)

Without SSDT (with Clover Injection of FB Orinoco, Inject ATI)
Metal 51217
OpenCL 44676

  • SMBios iMac 18,2
  • Sapphire RADEON RX 580 8GB GDDR5 PULSE
  • Catalina 10.15.4
  • Lilu 1.4.3, WEG 1.3.8

IOReg dump (with SSDT, without clover injection)
 

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Okay, SSDT made for Catalina, I understand. Nevertheless here are my results with the top switch of my RX 580 Nitro+ in its "performance" position. No SSDT (on left) vs. with SSDT (on right). In Mojave!

Perf Mode - No SSDT.jpgPerf Mode - With SSDT V1.0.jpg
 
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Hi @yellocab Could you take a look at my config and suggest a procedure? I tried the one that is described here (with dummy kext + ssdt table) but no success. I tried the RB kext, that worked, but fans were spinning all the time at max. I think I might have implemented something in a wrong way. I would be very grateful if you could take a look, thanks!

PS: I have a Sapphire Vega 56.

Sorry but our builds are really different.

On my build:
My iGPU is disabled SMBIOS iMacPro
No graphic patch (GFX to iGPU PEGP to EGP0)
No darkwake

Yellocab
 
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