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I had Intel® NUC Kit D54250WYKH with centos 7 running and after it became faulty i build another system with :

CPU : AMD Ryzen 3 2200g,
RAM : CORSAIR 8GB Vengeance LPX DDR4 PC4-19200 2400MHz, Motherboard : MSI A320M Pro-VD/

The old installation still works with the new hardware. I am wondering how does it works because i don't remember installing amd drivers (audio, video or graphics).

Are these drivers loaded automatically by the grub2 bootloader ignoring the intel drivers.Can someone explain?

Here is the output of lspci:

(base) [msingh@centos ~]$ lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15d0
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 15d1
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15db
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15dc
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e8
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e9
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ea
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15eb
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ec
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ed
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ee
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ef
12:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43bc (rev 02)
12:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43b8 (rev 02)
12:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b3 (rev 02)
20:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
20:05.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
20:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
20:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
25:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
29:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] (rev c8)
29:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 15de
29:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 15df
29:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e0
29:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e1
29:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Device 15e3
2a:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 61)

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