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Gigabyte's latest BIOS update enables PCIe 4.0 support on its AMD X470 and B450 motherboards

PCIe Gen4 in the Gigabyte X470 Aorus Gaming Wi-Fi 7 motherboard. (Source: u/mVran on Reddit)
PCIe Gen4 in the Gigabyte X470 Aorus Gaming Wi-Fi 7 motherboard. (Source: u/mVran on Reddit)
Gigabyte has released new AGESA microcode updates for its X470 and B450 offerings that seem to enable PCIe Gen4 support in the BIOS. The feature, originally thought to be available only on upcoming AMD X570 motherboards, can enable Gen4 speeds on the nearest PCIe slot connected to the Ryzen 3000 CPU. Other PCIe lanes going to the chipset and M.2 slots will continue to operate at PCIe Gen3 speeds.
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We know that AMD's upcoming Zen2 Ryzen 3000 CPUs will bring support for the new PCI Express (PCIe) 4.0 standard but so far, it was thought that this would also require a motherboard with the X570 chipset. Looks like that might not be entirely true as Gigabyte has rolled out BIOS updates to its X470 and B450 motherboards that enables the PCIe 4.0 option in the BIOS. 

Spotted by user mVran on Reddit for the Gigabyte X470 Aorus Gaming Wi-Fi 7 motherboard, the latest F40 BIOS update adds a Gen4 option to the PCIe Slot Configuration setting in the BIOS. Users with Gigabyte B450 motherboards in the same thread have also reported that the PCIe Gen4 option along with an unlocked BCLK was available upon installing the F40 update.

While the prospect of PCIe 4.0 support for older motherboards sounds enticing, there are a few things to keep in mind here. For one, this setting will work only when a Ryzen 3000-series CPU is installed in the socket. Also, the PCIe 4.0 speeds are applicable only for lanes directly coming from the CPU — in most cases, this is the first x16 slot. The lanes coming from the chipset and M.2 slots will continue to work at PCIe 3.0 speeds. 

AMD had earlier confirmed that current 300 and 400-series AM4 motherboards can support PCIe 4.0 but has left it to the motherboard vendors' discretion whether or not to implement the feature. The slot selection for Gen4 support will also depend on the board's layout and PCIe lane lengths. Any PCIe slots with PCIe 3.0 switches or extra routing will not be able to support Gen4 speeds.

The fact that users of older Ryzen motherboards stand a chance to get at least one PCIe slot upgraded to Gen4 is a quite a bonus for customers. Most motherboard OEMs have started shipping BIOS updates to offer in-place support for Ryzen 3000 chips. It remains to be seen which of these updates actually enable PCIe Gen4 support and on which motherboard models.

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Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - Managing Editor - 1355 articles published on Notebookcheck since 2012
Though a cell and molecular biologist by training, I have been drawn towards computers from a very young age ever since I got my first PC in 1998. My passion for technology grew quite exponentially with the times, and it has been an incredible experience from being a much solicited source for tech advice and troubleshooting among family and friends to joining Notebookcheck in 2017 as a professional tech journalist. Now, I am a Lead Editor at Notebookcheck covering news and reviews encompassing a wide gamut of the technology landscape for Indian and global audiences. When I am not hunting for the next big story or taking complex measurements for reviews, you can find me unwinding to a nice read, listening to some soulful music, or trying out a new game.
contact me via: @Geeky_Vaidy
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2019 05 > Gigabyte's latest BIOS update enables PCIe 4.0 support on its AMD X470 and B450 motherboards
Vaidyanathan Subramaniam, 2019-05-19 (Update: 2019-05-19)