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NVME SSD and RX5700 performance problem on 10.15.2

Joined
Feb 26, 2015
Messages
46
Motherboard
AsRock Z390 Phantom-gaming itx/ac
CPU
i7-8700K
Graphics
Sapphire RX5700
Mac
iMac
Mobile Phone
iOS
At first by link below my guide to install:
https://www.tonymacx86.com/threads/success-asrock-z370-fatality-itx-ac-8700k-rx5700.287418/

Screen Shot 2019-12-12 at 16.53.48.png


After updated to 10.15.4 I noticed that GPU performance dropped, and final release 10.15.2 not solve this problem. I tried updated from 10.15.1 to 10.15.2, tried clean vanilla install but no matter. In my case on 10.15.2 GPU – Sapphire RX5700 not works at full speed. I get 26k max at Geekbench 5 openCL unless 47-49k on 10.15.1. Game performance dropped too. But if I replace main SSD from NVME to SATA m2 I can return performance with booting in clover AGDPMOD=IGNORE. That works only with SATA SSD M2. Seems like software or hardware conflict with PCIe lines.
Does anybody know what is it, and how to cook it right.

My EFI attached.

MODO AsROCK Z370 Fatality itx/ac
NVME Samsung EVO 970
CPU 8700K
GPU Sapphire RX5700
 

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