ASUS ROG STRIX B450-F GAMING II
AM4, AMD B450, ATX
Question about ASUS ROG STRIX B450-F GAMING II
If M2_2 socket is needed, then Pcie_1 slot only runs x8 instead of x16. Or? On the one hand, M2_2 is the slot with the heat sink for the SSD, on the other hand Asus recommends: graphics card on Pcie_1... But it's strange that a motherboard is designed in such a way that the recommended slots interfere negatively with the graphics card running only on x8... OR the SSD has to be relocated on M2_1 (without heat sink). What do you think?
Helpful answer
x8 is sufficient. Performance loss is within the measurement tolerance range. Besides, a Ryzen CPU only has 24 PCIe lanes. 4 of them are for the chipset of the motherboard and 20 "for the rest". I have both m2 on the Ryzen 5800x. Slots occupied besides the graphics card I also have a x4 10GBit network card. => would be 24 lanes if the graphics card were running on x16. But as mentioned at the beginning, x8 is perfectly sufficient. With PCIE4, x4 would theoretically also be perfectly sufficient.
You don't seem to know much about hardware, but that doesn't matter. You have me.
One PCIe slot for the graphics card, which is controlled at eight times the speed, is enough even for the latest graphics cards to develop their full performance.
So if you use the M.2 slot with the heat sink, it needs four PCIe lanes so that the SSD can develop its full performance.
The slots do not "hinder" each other, but divide the PCIe lanes available due to the system among themselves in such a way that no performance is noticeably lost at any slot.
You can even use both M.2 slots at full speed and only have to do without SATA ports 1 and 2.
What more do you want?
By the way, this is the case with all PCIe 3.0 boards.
But I think the cpu only has 20 lanes, not 24...
Are lanes = threads? Because with the Ryzen 7 5800x, only 16 threads are specified here at digitec.