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Force secondary GPU for unraid

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hi all,

 

first i'm new to unraid.

Here is the problem, i have two GPUs, on the 16x rx570, and on the 4x gtx660.

i want unraid to boot with the gtx660 as gpu so that i passthrough the rx570 to a windows 10 VM.

 

i tried by searching in the bios if i can do so, and didn't find anything.

 

can someone help?

some information below if needed.

Model: Custom
M/B: Micro-Star International Co., Ltd B450 GAMING PLUS MAX (MS-7B86) Version 3.0 - s/n: To be filled by O.E.M.
BIOS: American Megatrends Inc. Version H.50. Dated: 11/07/2019
CPU: AMD Ryzen 5 3600 6-Core @ 3600 MHz
HVM: Enabled
IOMMU: Enabled
Cache: 384 KiB, 3072 KiB, 32768 KiB
Memory: 32 GiB DDR4 (max. installable capacity 128 GiB)
Network: bond0: fault-tolerance (active-backup), mtu 1500
 eth0: 100 Mbps, full duplex, mtu 1500
Kernel: Linux 4.19.94-Unraid x86_64
OpenSSL: 1.1.1d
Uptime: 
PCI Devices and IOMMU Groups

IOMMU group 0:	[1022:1482] 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 1:	[1022:1483] 00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge
IOMMU group 2:	[1022:1483] 00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge
IOMMU group 3:	[1022:1482] 00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 4:	[1022:1482] 00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 5:	[1022:1483] 00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP Bridge
IOMMU group 6:	[1022:1482] 00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 7:	[1022:1482] 00:05.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 8:	[1022:1482] 00:07.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 9:	[1022:1484] 00:07.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B]
IOMMU group 10:	[1022:1482] 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
IOMMU group 11:	[1022:1484] 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B]
IOMMU group 12:	[1022:1484] 00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B]
IOMMU group 13:	[1022:1484] 00:08.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Internal PCIe GPP Bridge 0 to bus[E:B]
IOMMU group 14:	[1022:790b] 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
[1022:790e] 00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
IOMMU group 15:	[1022:1440] 00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 0
[1022:1441] 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 1
[1022:1442] 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 2
[1022:1443] 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 3
[1022:1444] 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 4
[1022:1445] 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 5
[1022:1446] 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 6
[1022:1447] 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24: Function 7
IOMMU group 16:	[1987:5012] 01:00.0 Non-Volatile memory controller: Phison Electronics Corporation E12 NVMe Controller (rev 01)
IOMMU group 17:	[1022:43d5] 03:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset USB 3.1 XHCI Controller (rev 01)
[1022:43c8] 03:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset SATA Controller (rev 01)
[1022:43c6] 03:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Bridge (rev 01)
[1022:43c7] 20:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
[1022:43c7] 20:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
[1022:43c7] 20:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
[10ec:8168] 22:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
[10de:11c0] 25:00.0 VGA compatible controller: NVIDIA Corporation GK106 [GeForce GTX 660] (rev a1)
[10de:0e0b] 25:00.1 Audio device: NVIDIA Corporation GK106 HDMI Audio Controller (rev a1)
IOMMU group 18:	[1002:67df] 26:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev ef)
[1002:aaf0] 26:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
IOMMU group 19:	[1022:148a] 27:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Function
IOMMU group 20:	[1022:1485] 28:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Reserved SPP
IOMMU group 21:	[1022:1486] 28:00.1 Encryption controller: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Cryptographic Coprocessor PSPCPP
IOMMU group 22:	[1022:149c] 28:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Matisse USB 3.0 Host Controller
IOMMU group 23:	[1022:1487] 28:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller
IOMMU group 24:	[1022:7901] 30:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 51)
IOMMU group 25:	[1022:7901] 31:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 51)

 

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AFAIK, only Gigabyte motherboard allows you to pick a secondary GPU as Initial Display Output i.e. what Unraid boots with.

It's a BIOS option, not an Unraid option.

 

You have no choice but to swap the slot unfortunately.

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