B840 does not support PCIe 5.0
at all
One of these days the line of AMD Ryzen 9000 processors will be presented, and with them the new generation chipsets from the 800 line. A Gigabyte slide has leaked online, revealing details about these chipsets.
In general, the set is about the same as what we have now, but there are still differences. If now we have B650 and B650E chips, and both support PCIe 5.0, although the number of lanes varies greatly, then in the new line they will be replaced by the B840 and B850.
Even though they are close in name, the B840 is much inferior to the older solution. This set of logic, firstly, will not support PCIe 5.0 at all, that is, even installing an SSD with such an interface on the board will be useless (it will work in PCIe 4.0 mode), and secondly, this chipset will not support CPU overclocking functions , although it will be possible to overclock the RAM.
B850, in turn, will actually be even worse than the B650E, since the latter has 24 PCIe 5.0 lanes, that is, for both the SSD and the video card, while the B850 will only have lines for the drive. However, this is hardly a problem, since video cards with PCIe 5.0 do not even exist yet, and when they appear, they will not have an advantage when working in such a slot compared to PCIe 4.0.
You can also see that there are simply no new-generation low-end chipsets in the line, so manufacturers will continue to use the A620 and A620A.
Gigabyte also confirms that motherboards based on 800-series chipsets will support memory up to DDR5-8000 through EXPO profiles.