w10, drv 21.8.2

GPU1: AMD Radeon RX 5700 XT (pcie 3), OpenCL 2.0, 8 GB VRAM, 40 CUs
GPU2: AMD Radeon RX 6700 XT (pcie 7), OpenCL 2.0, 12 GB VRAM, 40 CUs
GPU3: AMD Radeon RX 6600 XT (pcie 10), OpenCL 2.0, 8 GB VRAM, 32 CUs
GPU4: AMD Radeon RX 6900 XT (pcie 13), OpenCL 2.0, 16 GB VRAM, 80 CUs
GPU5: AMD Radeon RX 6700 XT (pcie 18), OpenCL 2.0, 12 GB VRAM, 40 CUs
GPU6: AMD Radeon RX 6700 XT (pcie 21), OpenCL 2.0, 12 GB VRAM, 40 CUs

5.7b - 5.8c work
... -proto 2 -rate 1 -coin eth -mode 1 -gser 2 -amd -clKernel 1,0,1,1,0,0 -cvddc 750,900,750,900,900,900 -cclock 1280,1200,1200,1200,1200,1200 -mclock 1800,2150,2300,2150,2150,2100 -mt 1 -gt 35 -tt 60 -fanmin 35 -clf 0

not work
... -proto 2 -rate 1 -coin eth -mode 1 -gser 2 -amd -clKernel 1 -cvddc 750,900,750,900,900,900 -cclock 1280,1200,1200,1200,1200,1200 -mclock 1800,2150,2300,2150,2150,2100 -mt 1 -gt 35 -tt 60 -fanmin 35 -clf 0

my first post https://bitcointalk.org/index.php?topic=2647654.msg58250807#msg58250807